Title

Planar Integrated Plasmonic Mid-Ir Spectrometer

Keywords

mid-IR; SOI; surface plasmon; waveguides

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. © 2012 SPIE.

Publication Date

1-1-2012

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

8353

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.918671

Socpus ID

84901317492 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84901317492

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