Broadband spectrometer for ultrasensitive detection using plasmonic hyperbolic metamaterials

Ildar Salakhutdinov; Bo Shrewsbury; Librado Mancilla; Gobind Sohi; Jennifer Gavin; Austin Salas; Ertan Salik

doi:10.1117/12.2558862

20 May 2020 Broadband spectrometer for ultrasensitive detection using plasmonic hyperbolic metamaterials

Ildar Salakhutdinov, Bo Shrewsbury, Librado Mancilla, Gobind Sohi, Jennifer Gavin, Austin Salas, Ertan Salik

Proceedings Volume 11389, Micro- and Nanotechnology Sensors, Systems, and Applications XII; 113892U (2020) https://doi.org/10.1117/12.2558862
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

There are many applications which require high sensitivity spectral detection. In some cases, you need the wavelength range to be extended to cover all necessary spectral fingerprints. We are proposing a broadband spectrometer for ultrasensitive detection based on plasmonic hyperbolic metamaterials and diffraction gratings. Using variety of materials in fabrication of the hyperbolic metamaterials, we can cover the wide spectral range from near UV (~250 nm) to IR (~2 μm). In our spectrometer, the diffraction gratings have two functions. One is coupling the incident light source with the plasmonic guiding modes, which have a very high effective refractive index (≥8.1), much higher than the refractive index of germanium (4.05), the natural material with the highest refractive index. While a prism can also be used for coupling guiding modes with incident light, a diffraction grating is the only way to excite the guiding modes because of the plasmonics modes with very high effective refractive index. The second function of the diffraction gratings is their natural role in spectrometers. We demonstrated based on numerical simulations that we could reach high detection spectral sensitivity using compact diffraction gratings combined with hyperbolic metamaterials; the huge “n-meter” spectrometer is not necessary.

Citation Download Citation

Ildar Salakhutdinov, Bo Shrewsbury, Librado Mancilla, Gobind Sohi, Jennifer Gavin, Austin Salas, and Ertan Salik "Broadband spectrometer for ultrasensitive detection using plasmonic hyperbolic metamaterials", Proc. SPIE 11389, Micro- and Nanotechnology Sensors, Systems, and Applications XII, 113892U (20 May 2020); https://doi.org/10.1117/12.2558862

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KEYWORDS

Spectroscopy

Refractive index

Plasmonics

Dielectrics

Diffraction gratings

Metals

Waveguides

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