ORCID Profile
0000-0003-0216-3885
Current Organisations
Colorado School of Mines
,
Universite de Nice Sophia Antipolis
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Publisher: AIP Publishing
Date: 26-11-2012
DOI: 10.1063/1.4767646
Abstract: We show that perfect absorption can be achieved in a system comprising a single lossy dielectric layer of thickness much smaller than the incident wavelength on an opaque substrate by utilizing the nontrivial phase shifts at interfaces between lossy media. This design is implemented with an ultra-thin (∼λ/65) vanadium dioxide (VO2) layer on sapphire, temperature tuned in the vicinity of the VO2 insulator-to-metal phase transition, leading to 99.75% absorption at λ = 11.6 μm. The structural simplicity and large tuning range (from ∼80% to 0.25% in reflectivity) are promising for thermal emitters, modulators, and bolometers.
Publisher: Springer Science and Business Media LLC
Date: 13-01-2020
DOI: 10.1038/S41565-019-0611-Y
Abstract: Vertical cavity surface-emitting lasers (VCSELs) have made indispensable contributions to the development of modern optoelectronic technologies. However, arbitrary beam shaping of VCSELs within a compact system has remained inaccessible until now. The emerging ultra-thin flat optical structures, namely metasurfaces, offer a powerful technique to manipulate electromagnetic fields with subwavelength spatial resolution. Here, we show that the monolithic integration of dielectric metasurfaces with VCSELs enables remarkable arbitrary control of the laser beam profiles, including self-collimation, Bessel and Vortex lasers, with high efficiency. Such wafer-level integration of metasurface through VCSEL-compatible technology simplifies the assembling process and preserves the high performance of the VCSELs. We envision that our approach can be implemented in various wide-field applications, such as optical fibre communications, laser printing, smartphones, optical sensing, face recognition, directional displays and ultra-compact light detection and ranging (LiDAR).
Publisher: American Chemical Society (ACS)
Date: 09-08-2013
DOI: 10.1021/NL402039Y
Abstract: We report a new type of holographic interface, which is able to manipulate the three fundamental properties of light (phase, litude, and polarization) over a broad wavelength range. The design strategy relies on replacing the large openings of conventional holograms by arrays of subwavelength apertures, oriented to locally select a particular state of polarization. The resulting optical element can therefore be viewed as the superposition of two independent structures with very different length scales, that is, a hologram with each of its apertures filled with nanoscale openings to only transmit a desired state of polarization. As an implementation, we fabricated a nanostructured holographic plate that can generate radially polarized optical beams from circularly polarized incident light, and we demonstrated that it can operate over a broad range of wavelengths. The ability of a single holographic interface to simultaneously shape the litude, phase, and polarization of light can find widespread applications in photonics.
Publisher: IOP Publishing
Date: 27-05-2011
Publisher: American Chemical Society (ACS)
Date: 03-11-2010
DOI: 10.1021/NL102747V
Abstract: Enhancing nonlinear processes at the nanoscale is a crucial step toward the development of nanophotonics and new spectroscopy techniques. Here we demonstrate a novel plasmonic structure, called plasmonic nanocavity grating, which is shown to dramatically enhance surface nonlinear optical processes. It consists of resonant cavities that are periodically arranged to combine local and grating resonances. The four-wave mixing signal generated in our gold nanocavity grating is enhanced by a factor up to ≈2000, 2 orders of magnitude higher than that previously reported.
Publisher: The Optical Society
Date: 24-10-2011
DOI: 10.1364/OE.19.022113
Publisher: OSA
Date: 2014
Publisher: OSA
Date: 2011
Publisher: Wiley
Date: 28-03-2023
Abstract: Full wavefront control by photonic components requires that the spatial phase modulation on an incoming optical beam ranges from 0 to 2π. Because of their radiative coupling to the environment, all optical components are intrinsically non‐Hermitian systems, often described by reflection and transmission matrices with complex eigenfrequencies. Here, it is shown that parity or time symmetry breaking—either explicit or spontaneous—moves the position of zero singularities of the reflection or transmission matrices from the real axis to the upper part of the complex frequency plane. A universal 0 to 2π‐phase gradient of an output channel as a function of the real frequency excitation is thus realized whenever the discontinuity branch bridging a zero and a pole, that is, a pair of singularities, is crossing the real axis. This basic understanding is applied to engineer electromagnetic fields at interfaces, including, but not limited to, metasurfaces. Non‐Hermitian topological features associated with exceptional degeneracies or branch cut crossing are shown to play a surprisingly pivotal role in the design of resonant photonic systems.
Publisher: AIP Publishing
Date: 02-01-2012
DOI: 10.1063/1.3673334
Abstract: A flat optical device that generates optical vortices with a variety of topological charges is demonstrated. This device spatially modulates light beams over a distance much smaller than the wavelength in the direction of propagation by means of an array of V-shaped plasmonic antennas with sub-wavelength separation. Optical vortices are shown to develop after a sub-wavelength propagation distance from the array, a feature that has major potential implications for integrated optics.
Publisher: The Optical Society
Date: 11-10-2011
DOI: 10.1364/AO.50.000G56
Publisher: Proceedings of the National Academy of Sciences
Date: 15-12-2014
Abstract: As powerful semiconductor laser sources open up new possibilities for the realization of compact and versatile spectroscopy and detection systems, monolithic control of the laser output characteristics becomes essential. Whereas engineering of spectral characteristics and beam shape has reached a high level of maturity, manipulation of the polarization state remains challenging. We present a method for monolithic control of the degree of circular polarization by aperture antennas forming a surface-emitting grating on a semiconductor laser cavity and demonstrate its realization for a terahertz quantum cascade laser. Our approach is not limited to the terahertz regime and paves the way to an increased functionality and customizability of monolithic laser sources for a variety of applications (e.g., vibrational circular dichroism spectroscopy).
Publisher: Springer Science and Business Media LLC
Date: 11-12-2012
DOI: 10.1038/NCOMMS2293
Abstract: Metallic components such as plasmonic gratings and plasmonic lenses are routinely used to convert free-space beams into propagating surface plasmon polaritons and vice versa. This generation of couplers handles relatively simple light beams, such as plane waves or Gaussian beams. Here we present a powerful generalization of this strategy to more complex wave-fronts, such as vortex beams that carry orbital angular momentum, also known as topological charge. This approach is based on the principle of holography: the coupler is designed as the interference pattern of the incident vortex beam and focused surface plasmon polaritons. We have integrated these holographic plasmonic interfaces into commercial silicon photodiodes, and demonstrated that such devices can selectively detect the orbital angular momentum of light. This holographic approach is very general and can be used to selectively couple free-space beams into any type of surface wave, such as focused surface plasmon polaritons and plasmonic Airy beams.
Publisher: Springer Science and Business Media LLC
Date: 19-07-2019
DOI: 10.1038/S41467-019-11030-1
Abstract: Allowing subwavelength-scale-digitization of optical wavefronts to achieve complete control of light at interfaces, metasurfaces are particularly suited for the realization of planar phase-holograms that promise new applications in high-capacity information technologies. Similarly, the use of orbital angular momentum of light as a new degree of freedom for information processing can further improve the bandwidth of optical communications. However, due to the lack of orbital angular momentum selectivity in the design of conventional holograms, their utilization as an information carrier for holography has never been implemented. Here we demonstrate metasurface orbital angular momentum holography by utilizing strong orbital angular momentum selectivity offered by meta-holograms consisting of GaN nanopillars with discrete spatial frequency distributions. The reported orbital angular momentum-multiplexing allows lensless reconstruction of a range of distinctive orbital angular momentum-dependent holographic images. The results pave the way to the realization of ultrahigh-capacity holographic devices harnessing the previously inaccessible orbital angular momentum multiplexing.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2013
Publisher: OSA
Date: 2011
Publisher: American Physical Society (APS)
Date: 31-08-2012
Publisher: Wiley
Date: 02-2021
No related grants have been discovered for patrice Genevet.