Dr. Ryan M. Gelfand Profile

Dr. Ryan M. Gelfand

Assistant Professor at CREOL The College of Optics and Photonics

SPIE Involvement:

Author

Proceedings Article | 27 August 2014 Paper

New physics and applications of apertures in thin metal films

Reuven Gordon, Ahmed Al-Balushi, Abhay Kotnala, Ryan Gelfand, Skylar Wheaton, Shuwen Chen, Shilong Jin

Proceedings Volume 9172, 91720A (2014) https://doi.org/10.1117/12.2062919

KEYWORDS: Proteins, Optical tweezers, Metals, Molecules, Physics, Molecular interactions, Nanoparticles, Thin films, Scattering, Optical fibers

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Proceedings Article | 20 September 2013 Paper

Super resolution mapping of the near optical field and the gradient optical force

Ryan Gelfand, Alireza Bonakdar, O. Gokalp Memis, Hooman Mohseni

Proceedings Volume 8815, 88150R (2013) https://doi.org/10.1117/12.2024779

KEYWORDS: Near field optics, Atomic force microscopy, Near field scanning optical microscopy, Antennas, Plasmonics, Optical amplifiers, Near field, Microscopes, Modulation, Molecules

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Proceedings Article | 19 September 2013 Paper

Isolated nanoinjection photo detectors for high-speed and high-sensitivity single-photon detection

V. Fathipour, O. G. Memis, S. J. Jang, F. Khalid, R. Brown, I. Hassaninia, R. Gelfand, H. Mohseni

Proceedings Volume 8868, 886803 (2013) https://doi.org/10.1117/12.2024711

KEYWORDS: Sensors, Single photon detectors, Capacitance, Pulsed laser operation, Etching, Absorption, Measurement devices, Short wave infrared radiation, Photodetectors, Infrared detectors

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Proceedings Article | 11 September 2013 Paper

Direct measurement of bull’s-eye nanoantenna metal loss

Iman Hassani Nia, Sung Jang, Omer Memis, Ryan Gelfand, Hooman Mohseni

Proceedings Volume 8809, 880918 (2013) https://doi.org/10.1117/12.2024892

KEYWORDS: Temperature metrology, Metals, Gold, Cameras, Plasmonics, Calibration, Antennas, Reflectivity, Sensors, Nanoantennas

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Proceedings Article | 15 October 2012 Paper

Antenna integrated quantum cascade laser switchable via telecommunications wavelength probe beam

John Kohoutek, Alireza Bonakdar, Dibyendu Dey, Ryan Gelfand, Iman Hassani Nia, O. Memis, Vala Fathipour, Hooman Mohseni

Proceedings Volume 8456, 845606 (2012) https://doi.org/10.1117/12.929721

KEYWORDS: Antennas, Quantum cascade lasers, Modulation, Germanium, Switches, Near field optics, Polarization, Absorption, Telecommunications, Switching

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Proceedings Article | 15 October 2012 Paper

Nano-opto-mechanically modulated plasmonic nanoantenna-integrated quantum cascade laser

John Kohoutek, Dibyendu Dey, Alireza Bonakdar, Ryan Gelfand, Vala Fathipour, Omer Gokalp Memis, Hooman Mohseni

Proceedings Volume 8456, 84560K (2012) https://doi.org/10.1117/12.2006932

KEYWORDS: Quantum cascade lasers, Modulation, Antennas, Plasmonics, Atomic force microscopy, Sensors, Amplitude modulation, Near field optics, Reflectivity, Near field

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Proceedings Article | 9 October 2012 Paper

Surface plasmon enhancement of photon extraction efficiency by silver nanoparticles: with applications in laser cooling of semiconductors

Iman Hassani Nia, O. Memis, John Kohoutek, Ryan Gelfand, Hooman Mohseni

Proceedings Volume 8457, 84573V (2012) https://doi.org/10.1117/12.929356

KEYWORDS: Nanoparticles, Silver, Semiconductor lasers, Semiconductors, Microscopes, Luminescence, Mirrors, Surface plasmons, Scattering, Laser applications

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Proceedings Article | 9 September 2011 Paper

Opto-mechanical force measurement of deep sub-wavelength plasmonic modes

John Kohoutek, Dibyendu Dey, Alireza Bonakdar, Alejandro Sklar, Omer Memis, Ryan Gelfand, Hooman Mohseni

Proceedings Volume 8097, 80971T (2011) https://doi.org/10.1117/12.891888

KEYWORDS: Near field optics, Atomic force microscopy, Antennas, Near field, Plasmonics, Optical amplifiers, Near field scanning optical microscopy, Sensors, Optical fibers, Modulation

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Proceedings Article | 14 May 2011 Paper

A new generation of mid-infrared sensors based on quantum cascade laser

Dibyendu Dey, John Kohoutek, Ryan Gelfand, Alireza Bonakder, Hooman Mohseni

Proceedings Volume 8034, 803404 (2011) https://doi.org/10.1117/12.884815

KEYWORDS: Antennas, Quantum cascade lasers, Near field optics, Optical antennas, Near field scanning optical microscopy, Metals, Near field, Plasmonics, Mid-IR, Nanorods

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Proceedings Article | 11 September 2010 Paper

Near field imaging of a plasmon photonic crystal patterned on the facet of a quantum cascade laser

Dibyendu Dey, Ryan Gelfand, John Kohoutek, Alireza Bonakdar, Hooman Mohseni

Proceedings Volume 7757, 77573H (2010) https://doi.org/10.1117/12.861450

KEYWORDS: Photonic crystals, Quantum cascade lasers, Near field scanning optical microscopy, Near field optics, Near field, Mid-IR, Silica, Gold, Plasmonics, Molecules

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Planar photonic crystal (PPC) has recently attracted much attention as a promising platform for the realization of compact nanocavity devices. Our proposed photonic crystal (PC) structure consists of a periodic hole array with a point defect at the center. The device has been integrated on the facet of a quantum cascade laser working in the mid-infrared region of optical spectrum. Finite-difference time domain (FDTD) simulations have been performed to optimize the design structure. Simulations showed that with a periodicity of the holes (Λ) between 1.3um and 1.4um, the near field enhancement at the center of the cavity on the same level as the top metal surface can be as high as 10 times the incident electric field. The radius of the hole and center cavity radius are 0.45 and 0.2 times Λ. The structure was simulated at experimentally measured operating wavelength (λ=5.98um) of our device. During fabrication, we used a buffer SiO₂ layer thickness of 100nm followed by metal-dielectric-metal structure with layer thicknesses of Au - SiO₂ -Au (100/20/ 100 nm). Next, the MDM photonic crystal design was fabricated on the MDM coated facet of the QCL using focused ion beam (FIB) milling. The integrated device has been tested using an apertureless mid-infrared near field scanning optical microscopy (a-NSOM). The measurement set-up is based on an inverted microscope coupled with a commercially available Atomic Forced Microscopy (AFM). Using this technique, we could simultaneously measure the topography and NSOM image of the photonic crystal integrated QCL. It showed that the combination of high quality factor and extremely low mode volume of the PC design can squeeze the optical mode within a nanometric spot size ~ 450nm. The experimental results is a proof of concept, although we believe, further optimization and improvisation with different PC designs can lead squeezing the optical mode into a much smaller volume. Such integrated device are capable of focusing radiant infrared light down to nanometer length scale and strongly enhance the near field intensity which can be extremely useful in molecular sensing.

Proceedings Article | 26 August 2010 Paper

An apertureless near-field scanning optical microscope for imaging surface plasmons in the mid-wave infrared

John Kohoutek, Dibyendu Dey, Ryan Gelfand, Alireza Bonakdar, Hooman Mohseni

Proceedings Volume 7787, 77870R (2010) https://doi.org/10.1117/12.861582

KEYWORDS: Near field scanning optical microscopy, Antennas, Surface plasmons, Quantum cascade lasers, Atomic force microscopy, Optical amplifiers, Mid-IR, Optical microscopes, Sensors, Nanorods

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Proceedings Article | 24 August 2010 Paper

Design of a plasmonic photonic crystal for single bio-molecule spectroscopy

Ryan Gelfand, Hooman Mohseni

Proceedings Volume 7759, 775907 (2010) https://doi.org/10.1117/12.861455

KEYWORDS: Dielectrics, Molecules, Terahertz radiation, Photonic crystals, Molecular interactions, Crystals, Plasmonics, Cladding, Sensors, Absorption

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Proceedings Article | 18 August 2010 Paper

A normal-incident quantum well infrared photodetector enhanced by surface plasmon resonance

Wei Wu, Alireza Bonakdar, Ryan Gelfand, Hooman Mohseni

Proceedings Volume 7780, 77801A (2010) https://doi.org/10.1117/12.871877

KEYWORDS: Quantum wells, Quantum well infrared photodetectors, Surface plasmons, Photodetectors, Plasmonics, Infrared radiation, Gold, Infrared imaging, Infrared detectors, Resonance enhancement

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Proceedings Article | 16 August 2010 Paper

Quantum cascade laser integrated with metal-dielectric-metal plasmonic antenna

Dibyendu Dey, Ryan Gelfand, John Kohoutek, Alireza Bonakdar, Hooman Mohseni

Proceedings Volume 7789, 77890L (2010) https://doi.org/10.1117/12.861451

KEYWORDS: Antennas, Quantum cascade lasers, Plasmonics, Near field optics, Metals, Optical antennas, Near field, Surface plasmons, Applied physics, Nanorods

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Showing 5 of 14 publications

Conference Committee Involvement (6)

Biosensing and Nanomedicine XII

11 August 2019 | San Diego, California, United States

Biosensing and Nanomedicine XI

19 August 2018 | San Diego, California, United States

Biosensing and Nanomedicine X

6 August 2017 | San Diego, California, United States

Biosensing and Nanomedicine IX

28 August 2016 | San Diego, California, United States

Biosensing and Nanomedicine VIII

9 August 2015 | San Diego, California, United States

Showing 5 of 6 Conference Committees

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