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Proceedings Paper

Micro-temperature sensor based on optical whispering gallery mode of fiber taper-microsphere coupling system
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Paper Abstract

Miniaturized Whispering Gallery Mode (WGM) temperature sensor has great potentials of high resolution and great on-chip integration capability. This study focuses on the development of this kind of sensor based on the shifting wavelength of the optical resonance due to thermal expansion and thermo-optic effects of a silica microsphere. Excellent linear dependence of the wavelength shift versus temperature rise is observed for three sizes of microspheres (D=90μm, 145μm and 313μm) in small temperature ranges (≤17K) at very low temperatures (113±1K to 173K). By comparing this observation with the results of similar sizes of microspheres of our previous study in near room temperature as well as with a theoretical analysis, a conclusion is drawn that thermal expansion and thermal optic coefficients need to be further studied for microscale silica materials. Ultra high resolution sensing capability as well as potentials of integrated & miniaturized applications of the WGM temperature sensor is discussed. A method is designed to initially characterize the WGM temperature measurement noise level due to self-heating effect of the WGM resonance.

Paper Details

Date Published: 24 August 2009
PDF: 12 pages
Proc. SPIE 7420, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III, 74200Q (24 August 2009); doi: 10.1117/12.827417
Show Author Affiliations
Qiulin Ma, Rutgers, The State Univ. of New Jersey (United States)
Tobias Rossmann, Rutgers, The State Univ. of New Jersey (United States)
Zhixiong Guo, Rutgers, The State Univ. of New Jersey (United States)


Published in SPIE Proceedings Vol. 7420:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III
Shizhuo Yin; Ruyan Guo, Editor(s)

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