Prof. Dragomir N. Neshev Profile

Prof. Dragomir N. Neshev

Professor at Australian National Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (43)

PROCEEDINGS ARTICLE | March 14, 2018

Optical frequency conversion at the nanoscale: metallic, dielectric, and semiconductor nanostructures (Conference Presentation)

Proc. SPIE. 10540, Quantum Sensing and Nano Electronics and Photonics XV

KEYWORDS: Semiconductors, Ultrafast phenomena, Nanostructures, Metals, Dielectrics, Silicon, Harmonic generation, Frequency conversion, Nanofabrication, Group III-V semiconductors

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PROCEEDINGS ARTICLE | September 22, 2017

All-dielectric transparent metasurfaces for holography and quantum tomography (Conference Presentation)

Proc. SPIE. 10345, Active Photonic Platforms IX

KEYWORDS: Holograms, Holography, Polarization, Scattering, Light scattering, Magnetism, Tomography, Mie scattering, Nanophotonics, Nano optics

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PROCEEDINGS ARTICLE | September 21, 2017

Nonlinear frequency conversion with all-dielectric nanoantennas (Conference Presentation)

Proc. SPIE. 10343, Metamaterials, Metadevices, and Metasystems 2017

KEYWORDS: Light sources, Polarization, Dielectrics, Silicon, Wavefronts, Antennas, Harmonic generation, Nonlinear frequency conversion, Beam controllers, Light

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PROCEEDINGS ARTICLE | September 21, 2017

Directional second harmonic generation from AlGaAs nanoantennas (Conference Presentation)

Proc. SPIE. 10343, Metamaterials, Metadevices, and Metasystems 2017

KEYWORDS: Plasmonics, Nanostructures, Second-harmonic generation, Signal attenuation, Glasses, Resistance, Nonlinear optics, Harmonic generation, Frequency conversion, Group III-V semiconductors

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PROCEEDINGS ARTICLE | August 15, 2017

Highly directional second-harmonic generation from AlGaAs nanoparticles (Conference Presentation)

Proc. SPIE. 10228, Nonlinear Optics and Applications X

KEYWORDS: Second-harmonic generation, Scattering, Dielectrics, Resistance, Laser scattering, Nonlinear optics, Frequency conversion, Group III-V semiconductors, Nanolithography, Dielectric polarization

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PROCEEDINGS ARTICLE | April 28, 2017

Hybrid metal-dielectric nanostructures for advanced light-field manipulation (Conference Presentation)

Proc. SPIE. 10115, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X

KEYWORDS: Gold, Optical components, Plasmonics, Nanostructures, Electron beam lithography, Dielectrics, Near field, Nanolithography, Near field optics, Photonic nanostructures

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PROCEEDINGS ARTICLE | April 28, 2017

Nonlinear dielectric metasurfaces for frequency conversion (Conference Presentation)

Proc. SPIE. 10113, High Contrast Metastructures VI

KEYWORDS: Ultrafast phenomena, Modulation, Polarization, Dielectrics, Wavefronts, Optical switching, Harmonic generation, Frequency conversion, Nonlinear control, Beam controllers

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PROCEEDINGS ARTICLE | April 28, 2017

Liquid-crystal tunable metasurfaces for phase modulation and beam deflection (Conference Presentation)

Proc. SPIE. 10113, High Contrast Metastructures VI

KEYWORDS: Nanostructures, Switches, Nanostructuring, Phase modulation, Silicon, Magnetism, Electromagnetic radiation, Liquid crystals, Electromagnetism, Nanolithography

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PROCEEDINGS ARTICLE | April 28, 2017

Enhancement of nonlinear-optical effects in silicon nanodisks driven by magnetic Mie resonances (Conference Presentation)

Proc. SPIE. 10113, High Contrast Metastructures VI

KEYWORDS: Plasmonics, Nanoparticles, Dielectrics, Silicon, Complex systems, Magnetism, Third-harmonic generation, Nanophotonics, Nonlinear response, Resonance enhancement

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PROCEEDINGS ARTICLE | November 9, 2016

Recent advances in metasurfaces and all-dielectric nanophotonics (Conference Presentation)

Proc. SPIE. 9918, Metamaterials, Metadevices, and Metasystems 2016

KEYWORDS: Metamaterials, Superposition, Polarization, Scattering, Laser scattering, Magnetism, Nanophotonics, Destructive interference, Current controlled current source

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PROCEEDINGS ARTICLE | November 3, 2016

Manipulation of photoluminescence of 2D MoSe2 by gold nanoantennas (Conference Presentation)

Proc. SPIE. 9932, Carbon Nanotubes, Graphene, and Emerging 2D Materials for Electronic and Photonic Devices IX

KEYWORDS: Gold, Plasmonics, Nanostructures, Nanoantennas, Luminescence, Numerical simulations, Transition metals, Control systems, Optoelectronics, Antennas

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PROCEEDINGS ARTICLE | November 3, 2016

Functional metasurfaces as novel two-dimensional metadevices (Conference Presentation)

Proc. SPIE. 9932, Carbon Nanotubes, Graphene, and Emerging 2D Materials for Electronic and Photonic Devices IX

KEYWORDS: Metamaterials, Plasmonics, Photon polarization, Luminescence, Dielectrics, Magnetism, Wavefronts, Liquid crystals, Antennas, Polarization control

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PROCEEDINGS ARTICLE | August 4, 2016

Third harmonic generation in isolated all dielectric meta-atoms (Conference Presentation)

Proc. SPIE. 9894, Nonlinear Optics and its Applications IV

KEYWORDS: Metamaterials, Nanostructures, Polarization, Spectroscopy, Dielectrics, Silicon, Magnetism, Nonlinear optics, Third-harmonic generation, Harmonic generation

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Two series of nanodisk arrays were designed. The first one was fabricated out of a silicon-on-insulator (SOI) wafer using electron-beam lithography and a reactive-ion etching process. The top layer of a SOI wafer is a 260-nm layer of monocrystalline (100)-cut silicon. We consider three square 400x400 μm2 arrays distinguished by the disk diameter values – 340, 345 and 360 nm, respectively; the period of the nanodisk ordering in the array amounted to 2.85 μm – this value allows for regarding the disks as isolated ones in terms of optical coupling. The nanodisk diameter choice specifies the magnetic dipolar (MD) resonance wavelength [1]. The second series of arrays was made of a 130-nm hydrogenated amorphous silicon (a-Si:H) film grown by plasma-enhanced chemical vapor deposition on a thin glass substrate. In order to study the nonlinear optical response of the nanodisks and verify the multipole resonances roles, we conducted third-harmonic generation (THG) spectroscopy measurements using a tunable (1.0-1.5 μm) optical parametric oscillator (200 fs pulses with the repetition rate of 76 MHz) pumped by a Ti:Sapphire laser. The laser beam waist diameter was set at 11 μm by an aspheric lens. The full thickness of both the SOI and glass wafers (∼500 μm each) was less than the waist depth. The resulting peak intensity reached the values of about 1 GW/cm2 in the sample plane. The laser beam polarization was linear as controlled by a Glan-Taylor laser prism. The transmitted and collimated THG signal was selected by a set of blue filters and detected by a photomultiplier tube connected with a lock-in amplifier. This signal was proven to be of TH origin by checking its cubic dependence on the pump power and by direct measurements of its spectrum. It was also verified that the THG beam was polarized parallel to the orientation of the pump beam polarization. It should be pointed out that the penetration depth of the THG into silicon does not exceed the nanodisk height. The experimental technique [2] of nonlinear spectroscopy consists of defining the ratio of the TH signal from the nanostructured area to the successively measured signal from the nearby area where the top layer of silicon was etched away (in the case of the SOI wafer) or to the signal from a reference channel (in the case of the a-Si:H film). These ratios reveal the enhanced third-order optical response; moreover, the dispersion of the silicon nonlinear susceptibility is thereby taken into account. The resultant normalized THG signal represents the nanodisks and their resonant contribution. In this contribution, we have shown the third-harmonic response of silicon nanodisks at their electric and magnetic dipolar resonances. The enhanced up-conversion efficiency at the MD resonance of the nanodisks is observed, whereas the electric dipolar resonance yields less nonlinear conversion. The maximum area-normalized THG enhancement is around 30. In this work, the observed linear and nonlinear spectra are confirmed by numerical calculations. [1] I. Staude, et al., ACS Nano, 7, 7824 (2013). [2] M.R. Shcherbakov, et al., Nano Lett., 14, 6488 (2014).

PROCEEDINGS ARTICLE | July 26, 2016

Highly-efficient all-dielectric Huygens' surface holograms (Conference Presentation)

Proc. SPIE. 9883, Metamaterials X

KEYWORDS: Metamaterials, Optical design, Holograms, Holography, Resonators, Dielectrics, Silicon

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Optical metasurfaces have developed as a breakthrough concept for advanced wave-front. Key to these “designer metasurfaces”[1] is that they provide full 360 degree phase coverage and that their local phase can be precisely controlled. The local control of phase, amplitude and polarization on an optically thin plane will lead to a new class of flat optical components in the areas of integrated optics, flat displays, energy harvesting and mid-infrared photonics, with increased performance and functionality. However, reflection and/or absorption losses as well as low polarization-conversion efficiencies pose a fundamental obstacle for achieving high transmission efficiencies that are required for practical applications. A promising way to overcome these limitations is the use of metamaterial Huygens’ surfaces [2-4], i.e., reflection-less surfaces that can also provide full 360 degree phase coverage in transmission. Plasmonic implementations of Huygens’ surfaces for microwave [2] and the mid-infrared spectral range [3], where the intrinsic losses of the metals are negligible, have been suggested, however, these designs cannot be transferred to near-infrared or even visible frequencies because of the high dissipative losses of plasmonic structures at optical frequencies. Here, we demonstrate the first holographic metasurface utilizing the concept of all-dielectric Huygens’ surfaces thereby achieving record transmission efficiencies of approximately 82% at 1477nm wavelength. Our low-loss Huygens’ surface is realized by two-dimensional subwavelength arrays of loss-less silicon nanodisks with both electric and magnetic dipole resonances [4]. By controlling the intrinsic properties of the resonances, i.e. their relative electric and magnetic polarizabilities, quality factors and spectral position, we can design silicon nanodisks to behave as near-ideal Huygens’ particles. This allows us to realize all-dielectric Huygens’ surfaces providing full 360 degree phase coverage that lack dissipative losses and also suppress unwanted reflections without relying on cross-polarization schemes that additionally suffer from polarization-conversion losses. We now use such Huygens’ surfaces in order to create a highly-efficient phase masks for the generation of optical holograms. By varying only one geometrical parameter, namely the lattice periodicity that can be controlled easily during the fabrication process we can effectively generate arbitrary hologram images from a 4-level phase discretization. In order to design the arrangement of the pixels in the metasurfaces, we calculate the phase mask required for a hologram generating the letters ‘hv’ in the hologram plane. In the next step the Huygens’ hologram is fabricated on a back-side polished SOI wafer by electron-beam lithography followed by a reactive-ion etching process. Then, we measure the phase of the generated hologram using a home-built Mach-Zehnder interferometer and perform a phase retrieval process to compare the experimental phase with the designed phase. Finally, we record the holographic image in the hologram plane and demonstrate that the device functionality is completely polarization insensitive with a transmission efficiency of 82%, in contrast to all the earlier works utilizing geometric phase. References [1] Yu et al., Nat. Mater. 13, 139 (2014). [2] Pfeiffer et al., Phys. Rev. Lett. 110, 197401 (2013). [3] Monticone et al., Phys. Rev. Lett. 110, 203903 (2013). [4] Decker et al., Adv. Opt. Mater. 3, 813 (2015).

PROCEEDINGS ARTICLE | November 12, 2014

Metasurfaces inner symmetries: from square lattices to quasicrystalline layouts (presentation video)

Proc. SPIE. 9160, Metamaterials: Fundamentals and Applications 2014

KEYWORDS: Mirrors, Nanostructuring, Polarization, Optical properties, Video, Optical fabrication, Optical testing, Optical activity, Dichroic materials, Nanolithography

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PROCEEDINGS ARTICLE | November 12, 2014

High-transmittance all-dielectric Huygens' metasurfaces (presentation video)

Proc. SPIE. 9160, Metamaterials: Fundamentals and Applications 2014

KEYWORDS: Metamaterials, Holograms, Nanoparticles, Video, Magnetism, Wavefronts, Numerical simulations, Control systems, Transmittance, Phase measurement

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PROCEEDINGS ARTICLE | August 17, 2014

Positioning of single quantum dots on nanoscale areas of metal-free substrates (presentation video)

Proc. SPIE. 9162, Active Photonic Materials VI

KEYWORDS: Semiconductors, Lithography, Electron beam lithography, Metals, Glasses, Video, Quantum dots, Information technology, Photomasks, Nanofabrication

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PROCEEDINGS ARTICLE | October 15, 2012

Tunable and nonlinear fishnet metamaterials based on liquid crystal infiltration

Proc. SPIE. 8455, Metamaterials: Fundamentals and Applications V

KEYWORDS: Metamaterials, Refractive index, Magnesium fluoride, Metals, Molecules, Dielectrics, Magnetism, Solids, Liquid crystals, Nonlinear response

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PROCEEDINGS ARTICLE | January 18, 2011

Degenerate four-wave mixing of optical vortices assisted by self-phase and cross-phase modulation

Proc. SPIE. 7747, 16th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Modulation, Physics, Phase shift keying, Wave propagation, Optical vortices, Scanning probe microscopy, Signal generators, Four wave mixing, Technetium, Spiral phase plates

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PROCEEDINGS ARTICLE | December 19, 2008

Multi-conical second harmonic waves via nonlinear diffractions in circularly poled nonlinear media

Proc. SPIE. 7027, 15th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Diffraction, Second-harmonic generation, Phase modulation, Modulation, Crystals, Physics, Nonlinear optics, Phase matching, Laser crystals, Nonlinear crystals

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PROCEEDINGS ARTICLE | December 19, 2008

Bright beam deflection by steering beams with mixed phase dislocations

Proc. SPIE. 7027, 15th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Modulation, Waveguides, Crystals, Physics, Numerical simulations, Computer generated holography, Laser crystals, Laser beam diagnostics, Beam propagation method, Spiral phase plates

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PROCEEDINGS ARTICLE | April 21, 2008

Control of pattern formation in a single feedback system by photonic bandgap structures

Proc. SPIE. 6989, Photonic Crystal Materials and Devices VIII

KEYWORDS: Diffraction, Mirrors, Beam splitters, Modulation, Crystals, Complex systems, Photonic crystals, Control systems, Laser crystals, Two wave mixing

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PROCEEDINGS ARTICLE | January 8, 2008

Generation of conical second harmonic waves by nonlinear Bragg diffraction in two-dimensional nonlinear photonic structures

Proc. SPIE. 6801, Photonics: Design, Technology, and Packaging III

KEYWORDS: Superposition, Diffraction, Refractive index, Second-harmonic generation, Modulation, Polarization, Crystals, Nonlinear optics, Bessel beams, Nonlinear crystals

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PROCEEDINGS ARTICLE | January 8, 2008

Pulse monitoring based on transverse SHG in periodic and disordered media

Proc. SPIE. 6801, Photonics: Design, Technology, and Packaging III

KEYWORDS: Second-harmonic generation, Polarization, Cameras, Crystals, Physics, CCD cameras, Solids, Phase matching, Laser crystals, Nonlinear crystals

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PROCEEDINGS ARTICLE | January 8, 2008

Temporal nonlinear beam dynamics in infiltrated photonic-crystal fibers

Proc. SPIE. 6801, Photonics: Design, Technology, and Packaging III

KEYWORDS: Gold, Refractive index, Switches, Photonic crystal fibers, Nanoparticles, Photodiodes, Nonlinear optics, Temperature metrology, Liquids, Absorption

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PROCEEDINGS ARTICLE | March 13, 2007

Optical lattices as nonlinear photonic crystals

Proc. SPIE. 6604, 14th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Diffraction, Modulation, Waveguides, Crystals, Solitons, Photonic crystals, Wave propagation, Nonlinear optics, Geometrical optics, Light wave propagation

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PROCEEDINGS ARTICLE | March 5, 2007

Frequency doubling in SBN crystals with random ferroelectric domains in the thermal focusing regime

Proc. SPIE. 6604, 14th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Second-harmonic generation, Femtosecond phenomena, Polarization, Crystals, Physics, Nonlinear optics, Thermal effects, Laser crystals, Nonlinear crystals, Strontium

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PROCEEDINGS ARTICLE | March 5, 2007

Experimental reconstruction of a nonlocal nonlinear response function of a thermal medium

Proc. SPIE. 6604, 14th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Laser applications, Physics, Deconvolution, Holographic interferometry, Quantum electronics, Nonlinear response

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PROCEEDINGS ARTICLE | February 20, 2007

Control and compression of extreme spectrally-broadened pulses in highly nonlinear fiber

Proc. SPIE. 6453, Fiber Lasers IV: Technology, Systems, and Applications

KEYWORDS: Optical fibers, Ultrafast phenomena, Fiber amplifiers, Optical amplifiers, Dispersion, Solitons, Nonlinear optics, Raman scattering, Supercontinuum generation, Picosecond phenomena

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PROCEEDINGS ARTICLE | December 6, 2006

Two-dimensional nonlinear optically induced photonic lattices in photorefractive crystals

Proc. SPIE. 6023, Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals

KEYWORDS: Refractive index, Diamond, Modulation, Waveguides, Crystals, Solitons, Photonic crystals, Wave propagation, Nonlinear optics, Nonlinear crystals

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PROCEEDINGS ARTICLE | September 20, 2006

Observation of spatial phase shift in dark soliton crossing

Proc. SPIE. 6331, Linear and Nonlinear Optics of Organic Materials VI

KEYWORDS: Refractive index, Modulation, Physics, Solitons, Numerical simulations, CCD cameras, Nonlinear optics, Beam propagation method, Nonlinear response, Phase shifts

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PROCEEDINGS ARTICLE | October 13, 2005

Negative refraction in tunable periodic photonic structures

Proc. SPIE. 5950, Photonic Crystals and Fibers

KEYWORDS: Diffraction, Refractive index, Crystals, Solitons, Photonic crystals, Wave propagation, Refraction, Laser crystals, Negative refraction, Beam propagation method

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PROCEEDINGS ARTICLE | October 5, 2005

Nonlocal solitons

Proc. SPIE. 5949, Nonlinear Optics Applications

KEYWORDS: Refractive index, Physics, Solitons, Wave propagation, Nonlinear optics, Beam propagation method, Spatial solitons, Nonlinear response, Plasma, Liquids

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PROCEEDINGS ARTICLE | November 4, 2003

Generation of lattices of optical vortices

Proc. SPIE. 5226, 12th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Diffraction, Refractive index, Modulation, Laser beam propagation, Computer generated holography, Optical vortices, Laser beam diagnostics, Technetium, Spiral phase plates, Diffraction gratings

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PROCEEDINGS ARTICLE | May 30, 2001

Optical vortex solitons and nonlinear Aharanov-Bohm effect

Proc. SPIE. 4403, Second International Conference on Singular Optics (Optical Vortices): Fundamentals and Applications

KEYWORDS: Modulation, Scattering, Wavefronts, Solitons, Wave propagation, Optical vortices, Nonlinear optics, Analog electronics, Beam propagation method, Spiral phase plates

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PROCEEDINGS ARTICLE | April 12, 2001

Vector incoherent solitions

Proc. SPIE. 4271, Optical Pulse and Beam Propagation III

KEYWORDS: Crystals, CCD cameras, Laser crystals, Beam propagation method, Fiber optic illuminators

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PROCEEDINGS ARTICLE | April 9, 2001

Directional coupling and branching of optical signals by dark beams

Proc. SPIE. 4397, 11th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Energy efficiency, Refractive index, Beam splitters, Solitons, Numerical simulations, Optical vortices, Nonlinear optics, Beam propagation method, Spiral phase plates, Channel projecting optics

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PROCEEDINGS ARTICLE | April 9, 2001

Multiple-charged optical vortex solitons: existence and stability in saturable Kerr-type nonlinear media

Proc. SPIE. 4397, 11th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Modulation, Spatial frequencies, Solitons, Numerical simulations, Computer generated holography, Optical vortices, Nonlinear optics, Technetium, Spiral phase plates, Binary data

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PROCEEDINGS ARTICLE | April 9, 2001

Nonlinear interaction of ring dark solitary waves with coaxial dark beams

Proc. SPIE. 4397, 11th International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Diffraction, Holograms, Switches, Numerical simulations, Computer generated holography, Optical vortices, Nonlinear optics, Solids, Spiral phase plates, Beam analyzers

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PROCEEDINGS ARTICLE | May 7, 1999

Stability of one-dimensional dark spatial solitons of finite second transverse extent

Proc. SPIE. 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications

KEYWORDS: Switching, Modulation, Waveguides, Solitons, Phase shift keying, Nonlinear optics, Technetium, Spiral phase plates, Spatial solitons, Decision support systems

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PROCEEDINGS ARTICLE | December 27, 1996

Guiding and switching by quasi-2D dark spatial solitons

Proc. SPIE. 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications

KEYWORDS: Diffraction, Switching, Modulation, Waveguides, Solitons, Nonlinear optics, Solids, Laser beam diagnostics, Spatial solitons, Decision support systems

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PROCEEDINGS ARTICLE | December 27, 1996

Topological-charge-controlled interaction within ordered structures of optical vortex solitons

Proc. SPIE. 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications

KEYWORDS: Refractive index, Switching, Solitons, Optical vortices, Nonlinear optics, Solids, Technetium, Quantum electronics, Beam propagation method, Spiral phase plates

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PROCEEDINGS ARTICLE | December 27, 1996

Experimental investigation of computer-synthesized holograms for generation of ring dark solitary waves and optical vortex solitons

Proc. SPIE. 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications

KEYWORDS: Diffraction, Telescopes, Holograms, Solitons, Phase shift keying, CCD cameras, Computer generated holography, Optical vortices, Phase measurement, Spiral phase plates

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Showing 5 of 43 publications

Conference Committee Involvement (5)

Nonlinear Optics and its Applications

23 April 2018 | Strasbourg, France

Nonlinear Optics and its Applications

4 April 2016 | Brussels, Belgium

SPIE Micro+Nano Materials, Devices, and Systems

7 December 2015 | Sydney, New South Wales, Australia

Nonlinear Optics and its Applications

14 April 2014 | Brussels, Belgium

SPIE Micro+Nano Materials, Devices, and Systems

9 December 2013 | Melbourne, Victoria, Australia

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