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Proceedings Paper

On-chip infrared sensors: redefining the benefits of scaling
Author(s): Derek Kita; Hongtao Lin; Anu Agarwal; Anupama Yadav; Kathleen Richardson; Igor Luzinov; Tian Gu; Juejun Hu
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Paper Abstract

Infrared (IR) spectroscopy is widely recognized as a gold standard technique for chemical and biological analysis. Traditional IR spectroscopy relies on fragile bench-top instruments located in dedicated laboratory settings, and is thus not suitable for emerging field-deployed applications such as in-line industrial process control, environmental monitoring, and point-of-care diagnosis. Recent strides in photonic integration technologies provide a promising route towards enabling miniaturized, rugged platforms for IR spectroscopic analysis. It is therefore attempting to simply replace the bulky discrete optical elements used in conventional IR spectroscopy with their on-chip counterparts. This size down-scaling approach, however, cripples the system performance as both the sensitivity of spectroscopic sensors and spectral resolution of spectrometers scale with optical path length. In light of this challenge, we will discuss two novel photonic device designs uniquely capable of reaping performance benefits from microphotonic scaling. We leverage strong optical and thermal confinement in judiciously designed micro-cavities to circumvent the thermal diffusion and optical diffraction limits in conventional photothermal sensors and achieve a record 104 photothermal sensitivity enhancement. In the second example, an on-chip spectrometer design with the Fellgett’s advantage is analyzed. The design enables sub-nm spectral resolution on a millimeter-sized, fully packaged chip without moving parts.

Paper Details

Date Published: 17 April 2017
PDF: 14 pages
Proc. SPIE 10081, Frontiers in Biological Detection: From Nanosensors to Systems IX, 100810F (17 April 2017); doi: 10.1117/12.2250237
Show Author Affiliations
Derek Kita, Massachusetts Institute of Technology (United States)
Hongtao Lin, Massachusetts Institute of Technology (United States)
Anu Agarwal, Massachusetts Institute of Technology (United States)
Anupama Yadav, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Kathleen Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Igor Luzinov, Clemson Univ. (United States)
Tian Gu, Massachusetts Institute of Technology (United States)
Juejun Hu, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 10081:
Frontiers in Biological Detection: From Nanosensors to Systems IX
Amos Danielli; Benjamin L. Miller; Sharon M. Weiss, Editor(s)

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