Prof. Philippe Tassin Profile

Prof. Philippe Tassin

Associate Professor at Chalmers Univ

SPIE Involvement:

Scholarship Committee | Senior status | Conference Program Committee | Author

Area of Expertise:

metamaterials , nanophotonics , transformation optics , plasmonics , optical force , slow light

Publications (16)

PROCEEDINGS ARTICLE | September 22, 2016

Nonmagnetic metamaterial landscapes for guided electromagnetic waves

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

KEYWORDS: Metamaterials, Beam splitters, Waveguides, Dielectrics, Interfaces, Electromagnetic radiation, Wave propagation, Integrated optics, Electromagnetism, Radio propagation

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PROCEEDINGS ARTICLE | April 18, 2016

Transforming guided waves with metamaterial waveguide cores

Proc. SPIE. 9883, Metamaterials X

KEYWORDS: Metamaterials, Optical design, Beam splitters, Waveguides, Dispersion, Dielectrics, Interfaces, Wave propagation, Integrated optics, Integrated optics, Planar waveguides, Geometrical optics, Light wave propagation

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PROCEEDINGS ARTICLE | April 18, 2016

Transformation optics approach for Goos-Hänchen shift enhancement at metamaterial interfaces

Proc. SPIE. 9883, Metamaterials X

KEYWORDS: Metamaterials, Metamaterials, Refractive index, Interfaces, Geometrical optics, Geometrical optics, Electromagnetism, Electroluminescent displays, Maxwell's equations

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Since its first observation in 1947, the Goos-Hänchen effect—an electromagnetic wave phenomenon where a totally reflected beam with finite cross section undergoes a lateral displacement from its position predicted by geometric optics—has been extensively investigated for various types of optical media such as dielectrics, metals and photonic crystals. Given their huge potential for guiding and sensing applications, the search for giant and tunable Goos-Hänchen shifts is still an open question in the field of optics and photonics. Metamaterials allow for unprecedented control over electromagnetic properties and thus provide an interesting platform in this quest for Goos-Hänchen shift enhancement. Over the last few years, the Goos-Hänchen effect has been investigated for specific metamaterial interfaces including graphene-on-dielectric surfaces, negative index materials and epsilon- near-zero materials. In this contribution, we generalize the approach for the investigation of the Goos-Hänchen effect based on the geometric formalism of transformation optics. Although this metamaterial design methodology is generally applied to manipulate the propagation of light through continuous media, we show how it can also be used to describe the reflections arising at the interface between a vacuum region and a transformed region with a metamaterial implementation. Furthermore, we establish an analytical model that relates the magnitude of the Goos-Hänchen shift to the underlying geometry of the transformed medium. This model shows how the dependence of the Goos-Hänchen shift on geometric parameters can be used to dramatically enhance the size of the shift by an appropriate choice of permittivity and permeability tensors. Numerical simulations of a beam with spatial Gaussian profile incident upon metamaterial interfaces verify the model and firmly establish a novel route towards Goos-Hänchen shift engineering using transformation optics.

PROCEEDINGS ARTICLE | August 31, 2015

Transforming Cherenkov radiation in metamaterials

Proc. SPIE. 9546, Active Photonic Materials VII

KEYWORDS: Metamaterials, Refractive index, Transparency, Particles, Physics, Electromagnetism, Phase velocity, Electroluminescent displays, Cerenkov radiation imaging, Charged particle optics

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PROCEEDINGS ARTICLE | May 2, 2014

Metamaterials enhancing optical forces

Proc. SPIE. 9125, Metamaterials IX

KEYWORDS: Metamaterials, Waveguides, Scattering, Cladding, Dielectrics, Magnetism, Optical tweezers, Geometrical optics, Electromagnetism, Near field optics

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The interaction between light and matter involves not only an energy transfer, but also the transfer of linear momentum. In everyday life applications this linear momentum of light is too small to play any significant role. However, in nanoscale dimensions, the associated optical forces start to play an increasingly important role. These forces are, e.g., large enough for exiting experiments in the fields of cavity-optomechanics, laser cooling and optical trapping of small particles. Recently, it has been suggested that optical gradient forces can also be employed for all-optical actuation in micro- and nanophotonic systems. The typical setup consists of two slab waveguides positioned in each others vicinity such that they are coupled through the interaction of the evanescent tails. Although the gradient forces between these waveguides can be enhanced considerably using electromagnetic resonators or slow-light techniques, the resulting displacements remain relatively small. In this contribution, we present an alternative approach to enhance optical gradient forces between waveguides using a combination of transformation optics and metamaterials. Our design starts from the observation that gradient forces exponentially decay with the separation distance between the waveguides. Therefore, we employ transformation optics to annihilate the apparent distance for light between the waveguides. Analytical calculations confirm that the resulting forces indeed increase when such an annihilating cladding is inserted. Subsequently, we discuss the metamaterial implementation of this annihilating medium. Such lensing media automatically translate into anisotropic metamaterials with negative components in the permittivity and permeability tensors. Our full-wave numerical simulations show that the overall amplification is highly limited by the loss-tangent of the metamaterial cladding. However, as this cladding only needs to operate in the near-field for a specific polarization, we can also consider single-negative metamaterial implementations. We finally demonstrate that in this way metamaterials can support optical forces enhanced by more than 200 times [Phys. Rev. Lett. 110, 057401 (2013)].

PROCEEDINGS ARTICLE | September 11, 2013

Transforming optical forces

Proc. SPIE. 8806, Metamaterials: Fundamentals and Applications VI

KEYWORDS: Metamaterials, Waveguides, Scattering, Cladding, Dielectrics, Integrated optics, Geometrical optics, Nanophotonics, Electromagnetism, Radio propagation

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PROCEEDINGS ARTICLE | October 15, 2012

Design of nanophotonic elements with transformation optics

Proc. SPIE. 8463, Nanoengineering: Fabrication, Properties, Optics, and Devices IX

KEYWORDS: Metamaterials, Optical components, Optical design, Dielectrics, Electromagnetic radiation, Nanophotonics, Electromagnetism, Electroluminescent displays, Americium, Maxwell's equations

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PROCEEDINGS ARTICLE | May 1, 2012

Optical pulse frequency conversion inside transformation-optical metamaterials

Proc. SPIE. 8423, Metamaterials VII

KEYWORDS: Metamaterials, Dielectrics, Electromagnetic radiation, 3D modeling, Free space optics, Geometrical optics, Frequency conversion, Electromagnetism, Electroluminescent displays, Maxwell's equations

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Based on the analogy between the Maxwell equations in complex metamaterials and the free-space Maxwell equations on the background of an arbitrary metric, transformation optics allows for the design of metamaterial devices using a geometrical perspective. This intuitive geometrical approach has already generated various novel applications within the elds of invisibility cloaking, electromagnetic beam manipulation, optical information storage, and imaging. Nevertheless, the framework of transformation optics is not limited to three-dimensional transformations and can be extended to four-dimensional metrics, which allow for the implementation of metrics that occur in general relativistic or cosmological models. This enables, for example, the implementation of black hole phenomena and space-time cloaks inside dielectrics with exotic material parameters. In this contribution, we present a time-dependent metamaterial device that mimics the cosmological redshift. Theoretically, the transformation-optical analogy requires an innite medium with a permittivity and a permeability that vary monotonically as a function of time. We demonstrate that the cosmological frequency shift can also be reproduced in more realistic devices, considering the fact that practical devices have a nite extent and bound material parameters. Indeed, our recent numerical results indicate that it is possible to alter the frequency of optical pulses in a medium with solely a modulated permittivity. Furthermore, it is shown that the overall frequency shift does not depend on the actual variation of the permittivity. The performance of a nite frequency converter is, for example, not aected by introducing the saw tooth evolution of the material parameters. Finally, we studied the eect of the introduction of realistic metamaterial losses and, surprisingly, we found a very high robustness with respect to this parameter. These results open up the possibility to fabricate this frequency converting device with currently available metamaterials [V. Ginis, P. Tassin, B. Craps, and I. Veretennico, Opt. Express 18, 5350{5355 (2010)¹].

PROCEEDINGS ARTICLE | September 10, 2011

Frequency conversion by the transformation-optical analogue of the cosmological redshift

Proc. SPIE. 8093, Metamaterials: Fundamentals and Applications IV

KEYWORDS: Metamaterials, Optical fibers, Dielectrics, Physics, Electromagnetic radiation, Free space optics, Frequency conversion, Electromagnetism, Radio propagation, Maxwell's equations

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PROCEEDINGS ARTICLE | April 29, 2010

Subwavelength optical cavities with high quality factor

Proc. SPIE. 7711, Metamaterials V

KEYWORDS: Metamaterials, Microresonators, Resonators, Dielectrics, Electromagnetic radiation, Refraction, Optical resonators, Spherical lenses, Electromagnetism, Optical microcavities

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PROCEEDINGS ARTICLE | September 4, 2008

Miniaturization of photonic waveguides by the use of left-handed materials

Proc. SPIE. 7029, Metamaterials: Fundamentals and Applications

KEYWORDS: Metamaterials, Fabry–Perot interferometers, Waveguides, Cladding, Dispersion, Interfaces, Wave propagation, Photonic integrated circuits, Geometrical optics, Phase shifts

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PROCEEDINGS ARTICLE | May 8, 2008

The dynamic behavior of a semiconductor ring laser

Proc. SPIE. 6997, Semiconductor Lasers and Laser Dynamics III

KEYWORDS: Mathematical modeling, Semiconductors, Continuous wave operation, Backscatter, Carbon dioxide lasers, Solid state lasers, Semiconductor lasers, Laser stabilization, Laser damage threshold, Modes of laser operation

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PROCEEDINGS ARTICLE | May 6, 2008

Sub-diffraction-limited localized structures: influence of linear non-local interactions

Proc. SPIE. 6987, Metamaterials III

KEYWORDS: Metamaterials, Diffraction, Microresonators, Modulation, Resonators, Solitons, Nonlinear optics, Solids, Optical resonators, Stereolithography

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PROCEEDINGS ARTICLE | May 6, 2008

Sub-wavelength waveguide structures

Proc. SPIE. 6987, Metamaterials III

KEYWORDS: Fabry–Perot interferometers, Waveguides, Cladding, Dispersion, Interfaces, Wave propagation, Photonics, Photonic integrated circuits, Geometrical optics, Phase shifts

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PROCEEDINGS ARTICLE | September 28, 2005

Spatial dissipative structures in a Fabry-Perot cavity with a negative refractive index

Proc. SPIE. 5955, Metamaterials

KEYWORDS: Bistability, Diffraction, Refractive index, Fabry–Perot interferometers, Modulation, Interfaces, Complex systems, Nonlinear optics, Partial differential equations, Bromine

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PROCEEDINGS ARTICLE | September 28, 2005

Analytical model for the optical propagation in a nonlinear left-handed material

Proc. SPIE. 5955, Metamaterials

KEYWORDS: Metamaterials, Diffraction, Dispersion, Dielectrics, Magnetism, Wave propagation, Nonlinear optics, Geometrical optics, Light wave propagation, Radio propagation

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