Publications

Results 176–200 of 203
Skip to search filters

Structure-property relations in negative permittivity reststrahlen materials for IR metamaterial applications

Ihlefeld, Jon I.; Ginn, James C.; Rodriguez, Marko A.; Kotula, Paul G.; Clem, Paul G.; Sinclair, Michael B.

We will present a study of the structure-property relations in Reststrahlen materials that possess a band of negative permittivities in the infrared. It will be shown that sub-micron defects strongly affect the optical response, resulting in significantly diminished permittivities. This work has implications on the use of ionic materials in IR-metamaterials.

More Details
TYPE Conference YEAR 2010
OSTI

High speed optical filtering using active resonant subwavelength gratings

Proceedings of SPIE - The International Society for Optical Engineering

Gin, A.V.; Kemme, S.A.; Boye, Robert B.; Peters, D.W.; Ihlefeld, Jon I.; Briggs, R.D.; Wendt, J.R.; Ellis, A.R.; Marshall, L.H.; Carter, T.R.; Hunker, J.D.; Samora, S.

In this work, we describe the most recent progress towards the device modeling, fabrication, testing and system integration of active resonant subwavelength grating (RSG) devices. Passive RSG devices have been a subject of interest in subwavelength-structured surfaces (SWS) in recent years due to their narrow spectral response and high quality filtering performance. Modulating the bias voltage of interdigitated metal electrodes over an electrooptic thin film material enables the RSG components to act as actively tunable high-speed optical filters. The filter characteristics of the device can be engineered using the geometry of the device grating and underlying materials. Using electron beam lithography and specialized etch techniques, we have fabricated interdigitated metal electrodes on an insulating layer and BaTiO3 thin film on sapphire substrate. With bias voltages of up to 100V, spectral red shifts of several nanometers are measured, as well as significant changes in the reflected and transmitted signal intensities around the 1.55um wavelength. Due to their small size and lack of moving parts, these devices are attractive for high speed spectral sensing applications. We will discuss the most recent device testing results as well as comment on the system integration aspects of this project. © 2010 Copyright SPIE - The International Society for Optical Engineering.

More Details
TYPE Conference YEAR 2010
ScopusOSTI
Results 176–200 of 203
Results 176–200 of 203