Author(s): Liu, WJ (Liu, Wenjing); Chen, YL (Chen, You-Ling); Tang, SJ (Tang, Shui-Jing); Vollmer, F (Vollmer, Frank); Xiao, YF (Xiao, Yun-Feng)

Source: NANO LETTERS Volume: 21 Issue: 4 Pages: 1566-1575 DOI: 10.1021/acs.nanolett.0c04090 Published: FEB 24 2021

Abstract: Optical microresonators have attracted intense interests in highly sensitive molecular detection and optical precision measurement in the past decades. In particular, the combination of a high quality factor with a small mode volume significantly enhances the nonlinear light-matter interaction in whispering-gallery mode (WGM) microresonators, which greatly boost nonlinear optical sensing applications. Nonlinear WGM microsensors not only allow for label-free detection of molecules with an ultrahigh sensitivity but also support new functionalities in sensing such as the specific spectral fingerprinting of molecules with frequency conversion involved. Here, we review the mechanisms, sensing modalities, and recent progresses of nonlinear optical sensors along with a brief outlook on the possible future research directions of this rapidly advancing field.

Accession Number: WOS:000624334100002

PubMed ID: 33356315

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Liu, Wenjing         B-3816-2019         0000-0002-9441-8859

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.0c04090