Optical microresonator based on hollow sphere with porous wall for chemical sensing.
A porous-wall hollow glass microsphere (PW-HGM) was investigated as an optical resonator for chemical vapor sensing. A single mode optical fiber taper was used to interrogate the microresonator. Adsorption of chemical molecules into the nanosized pores induced a refractive index change of the thin wall and thus a shift in its resonance spectrum. The PW-HGM resonator had shown higher vapor detection sensitivity in comparison with a solid microsphere under similar test conditions.
Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
Hanzheng
H
Wang
Lei
L
Yuan
Cheol-Woon
CW
Kim
Qun
Q
Han
Tao
T
Wei
Xinwei
X
Lan
Hai
H
Xiao