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Proceedings Paper

Planar integrated plasmonic mid-IR spectrometer
Author(s): Christopher J. Fredricksen; Justin W. Cleary; Walter R. Buchwald; Pedro Figueiredo; Farnood Khalilzadeh-Rezaie; Gautam Medhi; Imen Rezadad; Monas Shahzad; Mehmet Yesiltas; Janardan Nath; Javaneh Boroumand; Evan Smith; Robert E. Peale
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Paper Abstract

The convergence of silicon photonics and infrared plasmonics allows compact, chip-scale spectral sensors. We report on the development of a compact mid-IR spectrometer based on a broad-band IR source, dielectric waveguides, a transformer to convert between waveguide modes and surface plasmon polaritons (SPP), an interaction region where analyte molecules are interrogated by SPPs, an array of ring resonators to disperse the light into spectral components, and photodetectors. The mid-IR light source emits into a dielectric waveguide, leading to a region that allows coupling of the incident photons into SPPs. The SPPs propagate along a functionalized metal surface within an interaction region. Interactions between the propagating SPP and any analytes bound to the surface increase loss at those wavelengths that correspond to the analyte vibrational modes. After a suitable propagation length the SPP will be coupled back into a dielectric waveguide, where specific wavelength components will be out-coupled to detectors by an array of ring resonators. We have selected a 3.4 micron LED as the IR source, based on both cost and performance. Initial experiments with circular waveguides formed from GLSO glass include measurement of the loss per mm. Electrodynamic simulations have been performed to inform the eventual Si taper design of the proposed photonic/plasmonic transformer. The SPP propagation length necessary for a discernible change in the signal due to absorption in the interaction region has been estimated to be on the order of 1 mm, well within the bounds of calculated propagation lengths for SPPs on Au.

Paper Details

Date Published: 31 May 2012
PDF: 8 pages
Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835321 (31 May 2012); doi: 10.1117/12.918671
Show Author Affiliations
Christopher J. Fredricksen, LRC Engineering, Inc. (United States)
Justin W. Cleary, Air Force Research Lab. (United States)
Walter R. Buchwald, Solid State Scientific Corp. (United States)
Pedro Figueiredo, Univ. of Central Florida (United States)
Farnood Khalilzadeh-Rezaie, Univ. of Central Florida (United States)
Gautam Medhi, Univ. of Central Florida (United States)
Imen Rezadad, Univ. of Central Florida (United States)
Monas Shahzad, Univ. of Central Florida (United States)
Mehmet Yesiltas, Univ. of Central Florida (United States)
Janardan Nath, Univ. of Central Florida (United States)
Javaneh Boroumand, Univ. of Central Florida (United States)
Evan Smith, Univ. of Central Florida (United States)
Robert E. Peale, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 8353:
Infrared Technology and Applications XXXVIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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