Waveguide-enhanced Raman spectroscopy for field detection of threat materials

Emmons, Erik D.; Wilcox, Phillip G.; Roese, Erik S.; Tripathi, Ashish; Guicheteau, Jason A.; Hung, Kevin; Miller, Benjamin L.; Luta, Ethan P.; Yates, Matthew Z.; Tyndall, Nathan F.; Stievater, Todd H.

doi:10.1117/12.2610654

Cited by 1 publication

(1 citation statement)

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“…Waveguide-enhanced Raman spectroscopy (WERS) 1,2 has been used to demonstrate the detection of vaporphase chemicals such as organophosphonates 3,4 and liquid-phase targets such as biomarkers in water. [5][6][7] Recent advances have included the use of 300-mm photonic integrated circuit (PIC) foundries for fabrication and assembly 8 (AIM Photonics), the use of handheld spectrometers, 9 the design and verification of on-chip Raman filters, 10 and the demonstration of low-loss fiber coupling to PIC edge coupling.…”

Section: Introductionmentioning

confidence: 99%

Waveguide-enhanced Raman spectroscopy using visible laser excitation

Tyndall

Emmons

Pruessner

et al. 2023

Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV

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Waveguide-enhanced Raman spectroscopy (WERS) using nanophotonic waveguides has been used to demonstrate the detection of vapor-phase chemicals and liquid-phase biomolecules in water. The technique benefits from the fabrication processes and tolerances of CMOS foundries, but successful foundry-based WERS photonic integrated circuits (PICs) have only been demonstrated using excitation wavelengths of 1064 nm and 785 nm. Foundrybased PICS are beginning to operate with low loss at visible wavelengths, and WERS is uniquely poised to take advantage of this capability. Raman scattering cross-sections scale as λ −4 , so a visible WERS platform could enable increased sensitivity, decreased exposure times, and/or decreased laser powers. However, increased fluorescence, increased waveguide loss, and decreased feature sizes make WERS in the visible challenging. Here, we demonstrate WERS using 300-mm foundry-based fabrication (AIM Photonics) with 633 nm and 785 nm laser excitation. We also show the successful operation and integration of other required components for a compact WERS system operating in the visible, including edge-couplers and lattice filters.

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