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Camayd-Munoz, Phil

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Camayd-Munoz

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Phil

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Camayd-Munoz, Phil
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    Integrated Zero-Index Metamaterials
    (2016-09-13) Camayd-Munoz, Phil; Mazur, Eric; Loncar, Marko; Capasso, Federico; Clarke, David
    Nanotechnology has enabled the development of nanostructured composite materials (metamaterials) with exotic optical properties not found in nature. In the most extreme case, we can create materials that support light waves that propagate with infinite phase velocity, corresponding to a refractive index of zero. This zero index can only be achieved by simultaneously controlling the electric and magnetic resonances of the nanostructure. We present an in-plane metamaterial design consisting of silicon pillar arrays, embedded within a polymer matrix. Using an integrated nano-scale prism constructed of the proposed material, we demonstrate a refractive index of zero in the optical regime. This design serves as a novel on-chip platform to explore the exotic physics of zero-index metamaterials, with applications to super-coupling, integrated quantum optics, and phase matching.
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    Can Mixed-Metal Surfaces Provide an Additional Enhancement to SERS?
    (American Chemical Society, 2012) Olivares-Amaya, Roberto; Rappoport, Dmitrij; Camayd-Munoz, Phil; Peng, Paul; Mazur, Eric; Aspuru-Guzik, Alan
    We explore the chemical contribution to surface-enhanced Raman scattering (SERS) in mixed-metal substrates, both experimentally and by computer simulation. These substrates are composed of a chemically active, transition-metal overlayer deposited on an effective SERS substrate. We report improved analytical enhancement factors obtained by using a small surface coverage of palladium or platinum over nanostructured silver substrates. Theoretical predictions of the chemical contribution to the surface enhancement using density functional theory support the experimental results. In addition, these approaches show that the increased enhancement is due not only to an increase in surface coverage of the analyte but also to a higher Raman scattering cross section per molecule. The additional chemical enhancement in mixed-metal SERS substrates correlates with the binding energy of the analyte on the surface and includes both static and dynamical effects. SERS using mixed-metal substrates has the potential to improve sensing for a large group of analyte molecules and to aid the development of chemically specific SERS-based sensors.
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    On-chip zero-index metamaterials
    (Nature Publishing Group, 2015) Li, Yang; Kita, Shota; Camayd-Munoz, Phil; Reshef, Orad; Vulis, Daryl; Yin, Mei; Loncar, Marko; Mazur, Eric
    Metamaterials with a refractive index of zero exhibit physical properties such as infinite phase velocity and wavelength. However, there is no way to implement these materials on a photonic chip, restricting the investigation and application of zero-index phenomena to simple shapes and small scales. We designed and fabricated an on-chip integrated metamaterial with a refractive index of zero in the optical regime. Light refracts perpendicular to the facets of a prism made of this metamaterial, directly demonstrating that the index of refraction is zero. The metamaterial consists of low-aspect-ratio silicon pillar arrays embedded in a polymer matrix and clad by gold films. This structure can be fabricated using standard planar processes over a large area in arbitrary shapes and can efficiently couple to photonic integrated circuits and other optical elements. This novel on-chip metamaterial platform opens the door to exploring the physics of zero index and its applications in integrated optics.
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    Bioinspired micrograting arrays mimicking the reverse color diffraction elements evolved by the butterfly Pierella luna
    (Proceedings of the National Academy of Sciences, 2014) England, Grant Tyler; Kolle, Mathias; Kim, Philseok; Khan, Mughees; Camayd-Munoz, Phil; Mazur, Eric; Aizenberg, Joanna
    Recently, diffraction elements that reverse the color sequence normally observed in planar diffraction gratings have been found in the wing scales of the butterfly Pierella luna. Here, we describe the creation of an artificial photonic material mimicking this reverse color-order diffraction effect. The bioinspired system consists of ordered arrays of vertically oriented microdiffraction gratings. We present a detailed analysis and modeling of the coupling of diffraction resulting from individual structural components and demonstrate its strong dependence on the orientation of the individual miniature gratings. This photonic material could provide a basis for novel developments in biosensing, anticounterfeiting, and efficient light management in photovoltaic systems and light-emitting diodes.