97 research outputs found
New Propagation Effects in Semiconductors in the UV Range: Inhibition of Absorption, Negative Refraction, Anomalous Momentum States, Sub-Wavelength Imaging, and Non-Plasmonic Nanometer-size Guided Waves
No full textSecond Harmonic Generation from Nanoslits in Metal Substrates: Applications to Palladium based H2 Sensor
No full textWe conducted a theoretical investigation of second harmonic generation and other nonlinear features that result from the magnetic Lorentz force, when a single aperture is cut on a thick, opaque palladium substrate. We studied the dependences of linear pump transmission and second harmonic generation near resonance conditions, and explored the different physical mechanisms and their dependences, for example, geometrical features. We found that it is possible to exploit field localization and surface plasmon generation to enhance second harmonic generation in the regime of extraordinary transmittance of the pump field. Both transmitted and backward second harmonic generation conversion efficiencies were investigated. The results reveal that it may be possible to access several potential new applications. In particular, we demonstrated that the exploitation of a combination of nonlinear effects and enhanced transmission makes possible a palladium-based device suitable for H-2-leak-detection
Investigation on the interaction of Surface Plasmons (SP) with an Electro Optiic Polymer and Development of SP Optical Devices
No full textWe are designing and fabricating arrays of subwavelength SP structures in metal films and combining these structures with EO polymers to understand the interaction of the EO polymer with the enhanced electric fields of the plasmons. We have designed and modeled resonance structures to maximize extraordinary transmittance. We are making a systematic study of SP structure shapes by studying circular holes, elliptical holes and slits. Initially we have fabricated and begun optical evaluation of subwavelength slits in gold films. Slits with 32 nm width and 120nm width have been fabricated by a focused ion beam system. Preliminary optical transmittance measurements in the visible and NIR are underway and will be compared to theoretical modeling. © 2008 IEEE
New Propagation Effects in Semiconductors in the UV Range: Inhibition of Absorption, Negative Refraction, Anomalous Momentum States, and Sub-Wavelength Imaging
No full textNegative refraction and sub-wavelength resolution below the diffraction limit using a semiconductor-based superlens
No full text
Linear and nonlinear resonant effects in metallic arrays of sub-wavelength channels filled with GaAs
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