Silica hollow bottle resonators for use as whispering gallery mode based chemical sensors

A simple three-step method for making silica hollow bottle resonators (HBRs) was developed. This procedure is advantageous because it uses commercially available materials, is cost effective, and is easy to implement. Additionally, the use of these HBRs as whispering gallery mode based chemical sensors is demonstrated by preliminary absorption sensing results in the near infrared (1580–1660 nm) using a trace gas (CH₄) in air at atmospheric pressure and a dye (SDA2072) in methanol solution. (paper)