title: Ultrasensitive thermal sensors based on whispering gallery modes in a polymer core optical ring resonator.
abstract: This study proposes a thermal sensor based on whispering gallery modes (WGMs) in a polymer core optical ring resonator (PCORR). The thermal sensitivity and detection limit (i.e., the temperature resolution) for WGMs of various orders and polarizations are theoretically studied as a function of the ring wall thickness. The results show that the temperature detection limits can be as low as 4×10(-5) and 6×10(-6)  K for laser linewidths of 2 and 0.3 MHz, respectively. The ultrahigh temperature resolution makes the PCORR a very promising platform for temperature measurement. The analysis also shows that the WGM of a lower order has better thermal sensing performance and a thinner optimal thickness of the ring resonator.
authors: Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, China.
authors: Nai
authors: N
authors: Lin
authors: Lan
authors: L
authors: Jiang
authors: Sumei
authors: S
authors: Wang
authors: Hai
authors: H
authors: Xiao
authors: Yongfeng
authors: Y
authors: Lu
authors: Hailung
authors: H
authors: Tsai