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Proceedings Paper

Active resonant subwavelength grating devices for high speed spectroscopic sensing
Author(s): A. V. Gin; S. A. Kemme; R. R. Boye; D. W. Peters; J. F Ihlefeld; R. D Briggs; J. R Wendt; L. H Marshall; T. R. Carter; S. Samora
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Paper Abstract

In this paper, we describe progress towards a multi-color spectrometer and radiometer based upon an active resonant subwavelength grating (RSG). This active RSG component acts as a tunable high-speed optical filter that allows device miniaturization and ruggedization not realizable using current sensors with conventional bulk optics. Furthermore, the geometrical characteristics of the device allow for inherently high speed operation. Because of the small critical dimensions of the RSG devices, the fabrication of these sensors can prove challenging. However, we utilize the state-of-the-art capabilities at Sandia National Laboratories to realize these subwavelength grating devices. This work also leverages previous work on passive RSG devices with greater than 98% efficiency and ~1nm FWHM. Rigorous coupled wave analysis has been utilized to design RSG devices with PLZT, PMN-PT and BaTiO3 electrooptic thin films on sapphire substrates. The simulated interdigitated electrode configuration achieves field strengths around 3×107 V/m. This translates to an increase in the refractive index of 0.05 with a 40V bias potential resulting in a 90% contrast of the modulated optical signal. We have fabricated several active RSG devices on selected electro-optic materials and we discuss the latest experimental results on these devices with variable electrostatic bias and a tunable wavelength source around 1.5μm. Finally, we present the proposed data acquisition hardware and system integration plans.

Paper Details

Date Published: 9 February 2009
PDF: 9 pages
Proc. SPIE 7218, Integrated Optics: Devices, Materials, and Technologies XIII, 721815 (9 February 2009); doi: 10.1117/12.809645
Show Author Affiliations
A. V. Gin, Sandia National Labs. (United States)
S. A. Kemme, Sandia National Labs. (United States)
R. R. Boye, Sandia National Labs. (United States)
D. W. Peters, Sandia National Labs. (United States)
J. F Ihlefeld, Sandia National Labs. (United States)
R. D Briggs, Sandia National Labs. (United States)
J. R Wendt, Sandia National Labs. (United States)
L. H Marshall, Sandia National Labs. (United States)
T. R. Carter, Sandia Staffing Alliance, LLC (United States)
S. Samora, LMATA Government Services LLC (United States)

Published in SPIE Proceedings Vol. 7218:
Integrated Optics: Devices, Materials, and Technologies XIII
Jean-Emmanuel Broquin; Christoph M. Greiner, Editor(s)

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