Details

Autor(en) / Beteiligte

• Xie, Ran-Ran
• Wen, Pengyu
• Zhang, Hao
• Jia, Yuechen
• Cui, Xue-Qing
• Wang, Min
• Li, Gui-Qin
• Qin, Guo-Qing
• Chen, Feng
• Long, Gui-Lu

Titel

Heterodyne detection of backscattering for whispering-gallery-mode sensors

Ist Teil von

• Optics letters, 2022-08, Vol.47 (15), p.3944-3947

Ort / Verlag

Washington: Optical Society of America

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Optica Publishing Group Journals

Beschreibungen/Notizen

• Whispering-gallery-mode (WGM) microcavities have shown significant applications in nanoparticle sensing for environmental monitoring and biological analysis. However, the enhancement of detection resolution often calls for active cavities or elaborate structural designs, leading to an increase of fabrication complexity and cost. Herein, heterodyne amplification is implemented in WGM microsensors based on backscattering detection mechanism. By interfering with an exotic reference laser, the reflecting light backscattered by perturbation targets can be strongly enlarged, yielding an easy-to-resolve and consequently sensitive microsensor. The dependence of detection laser frequency has also been characterized with the assistance of optothermal dynamics. We show that exploiting heterodyne interferometry boosts the detection of weak signals in microresonator systems and provides a fertile ground for optical microsensor development.