Absorption spectroscopy and Raman scattering spectroscopy are powerful detection techniques widely used for sensitive and specific detection of gaseous and liquid analytes. Recent advances in nanophotonics including integrated light sources, detectors, and optical waveguides are opening the door for their miniaturization, all the way down to chip-scale devices. In this chapter, we provide a detailed review of the latest advances in waveguide-based absorption and Raman spectroscopic sensors. Special focus is on dedicated waveguide designs as well as on the use of enrichment claddings as a strategy for further sensitivity enhancement at the microscale. © 2023 Elsevier Ltd. All rights reserved

Anurup Datta

Department of Mechanical and Aerospace Engineering

J. Jágerská

S. Alberti

M. Vlk

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

IITH offers&nbsp;<a href="https://iith.ac.in/academics/under-graduate/">undergraduate programs</a>&nbsp;in all the classical engineering disciplines, applied sciences, design, as well as several modern interdisciplinary areas. Students are given a flexibility to explore a broad set of areas, and potentially pursue a minor or double major in a discipline that is not their own. Students who wish to seek a deeper understanding of their own discipline are strongly encouraged to get involved in cutting-edge research with the help of a faculty to mentor them, and earn an Honors in their own field.

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IITH creates a unique holistic ecosystem for education that offers interactive learning, a very flexible academic structure, cutting-edge research, strong industry collaboration, and entrepreneurship. This is an environment which enables students and faculty to translate their dreams into realities.

Journal	Encyclopedia of Sensors and Biosensors: Volume 1-4, First Edition
Publisher	Elsevier