Journal
APPLIED OPTICS
Volume 50, Issue 31, Pages G7-G10Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.50.0000G7
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Funding
- National Basic Research Program of China [2007CB307003]
- National Natural Science Foundation of China (NSFC) [60907036]
- Natural Science Foundation of Zhejiang Province, China [Y1090021]
- Fundamental Research Funds for the Central Universities [2010QNA5038]
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We demonstrate microrings assembled with polyacrylamide (PAM) microfibers for high-sensitivity relative humidity (RH) sensing. When exposed to moisture, the PAM microfiber absorbs water molecules and inflates monotonically with the increasing humidity, resulting in evident spectral shifts of the resonance peaks of the microring. By measuring the spectral shifts, the microring shows sensitivity as high as 490 pm/%RH and a response time of about 120 ms, within a dynamic range from 5% to 71% RH. (C) 2011 Optical Society of America
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