Mr. Edgar Palacios Profile

Edgar Palacios

at Northwestern Univ

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Publications (2)

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Proceedings Article | 5 October 2015 Presentation

Enhanced infrared transmission from gold wire-grid arrays via surface plasmons in continuous graphene (Presentation Recording)

Zizhuo Liu, Serkan Bütün, Edgar Palacios, Koray Aydin

Proceedings Volume 9546, 95461X (2015) https://doi.org/10.1117/12.2186872

KEYWORDS: Graphene, Gold, Surface plasmons, Mid-IR, Infrared radiation, Nanostructures, Plasmonics, Nanophotonics, Near field, Electromagnetic radiation

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Enhanced transmission of light through nanostructures has always been of great interest in the field of plasmonics and nanophotonics. With the aid of near-field effects, the transmission of the electromagnetic waves can be enhanced or suppressed. Much of the work on enhanced transmission has been shown to be frequency-selective. However it is possible to increase the transmission over a large frequency range by using graphene, which has shown broadband properties in many applications. Here, we propose enhanced transmission in wire grid gold structure making use of continuous graphene sheets. We use finite-difference time-domain simulations to study the optical properties of this graphene-metal hybrid structure at mid infrared (mid-IR) wavelengths. The grating structure in wire grid gold provides an ideal platform to match the momentum and excite the surface plasmon polaritons (SPPs) in monolayer graphene. Our numerical calculations show that the local electromagnetic field around the graphene is largely enhanced due to surface plasmons. Moreover, with the highly confined SPPs coupling with the incident light, the transmission through the whole structure can be broadly enhanced in the mid infrared region. We also analyze the effect of the spectrum with different periods and gold nanowire widths to evaluate the size effects of the plasmons in graphene. In addition, by tuning the Fermi level, one can control the wavelength range at which the transmission is enhanced. The mechanism of the enhancement will be explained in the calculated electric field distribution. And we will also highlight the opportunities of graphene for applications such as tunable transmission and active photonic modulator.

Proceedings Article | 5 October 2015 Presentation

Visible-frequency metasurfaces for broadband anomalous reflection and high-efficiency spectrum splitting (Presentation Recording)

Zhongyang Li, Edgar Palacios, Serkan Bütün, Koray Aydin

Proceedings Volume 9544, 954428 (2015) https://doi.org/10.1117/12.2187115

KEYWORDS: Polarization, Optical resonators, Visible radiation, Plasmonics, Wavefronts, Electromagnetic radiation, Holograms, Resonators, Antennas, Diffraction

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Metasurfaces offer new degrees of freedom in moulding the optical wavefronts by introducing abrupt and drastic changes in the amplitude, phase and/or polarization of electromagnetic radiation at the wavelength scale. By carefully arranging multiple subwavelength anisotropic or gradient optical resonators, metasurfaces have been shown to enable anomalous transmission, anomalous reflection, optical holograms and spin-orbit interaction. However, experimental realization of high-performance metasurfaces that can operate at visible frequency range has been a significant challenge due to high optical losses of plasmonic materials and difficulties in fabricating several subwavelength plasmonic resonators with high uniformity. Here, we propose a highly-efficient yet a simple metasurface design comprising of a single, anisotropic trapezoid-shape antenna in its unit cell. We demonstrate broadband (450 - 850 nm) anomalous reflection and spectrum splitting at visible and near-IR frequencies with 85% conversion efficiency. Average power ratio of anomalous reflection to the strongest diffraction mode was calculated to be on the order of 1000 and measured to be on the order of 10. The anomalous reflected photons have been visualized using a CCD camera, and broadband spectrum splitting performance has been confirmed experimentally using a free space, angle-resolved reflection measurement setup. Metasurface design proposed in this study is a clear departure from conventional metasurfaces utilizing multiple, anisotropic and/or gradient optical resonators, and could enable high-efficiency, broadband metasurfaces for achieving flat high SNR optical spectrometers, polarization beam splitters, directional emitters and spectrum splitting surfaces for photovoltaics.

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