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Authors: S. Clemmen, A. Raza, A. Dhakal, F. Peyskens, A. Subramanian, P, Van Dorpe, P.C. Wuytens, H. Zhao, E.M.P. Ryckeboer, S. Severi, N. Le Thomas, R. Baets
Title: Spectroscopic sensing with silicon nitride photonic integrated circuits
Format: International Conference Proceedings
Publication date: 1/2017
Journal/Conference/Book: Photonics West 2017, Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI (invited)
Volume(Issue): p.101060T
Location: San Francisco, United States
DOI: 10.1117/12.2256526
Citations: 3 ( - last update: 23/6/2024)
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Raman spectroscopy is a mature technology capable of identifying the chemical composition of nearly any sample based on the resonance frequencies of individual molecular bonds. Applications of Raman spectroscopy are extremely broad ranging from biology, chemistry, pharmaceutics, art preservation, or various monitoring [1].
In its most prevalent form, a Raman spectrometer consists of a laser, a focusing objective - often within a microscope -, a spectrometer, and a camera. As Raman spectroscopy relies on the very weak inelastic scattering of light onto matter, the laser has to deliver a relatively high power (10s mW) and the detector needs to be very sensitive and noise free. The detection is currently the bottleneck that prevents Raman spectroscopy to be even more broadly used. The detection is indeed expensive both in term of time and equipment cost. Therefore, many solutions have been investigated to relax the requirement for a state of the art detector by boosting the Raman response. Stimulated Raman spectroscopy[2] allows using more noisy detectors but at the cost of an extra more complex laser.

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