Journal of Jilin University (Information Science Edition) ›› 2025, Vol. 43 ›› Issue (2): 213-219.

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Self-Mixing Interferometer Based on Microsphere Superlens

ZHOU Yekun, GAO Bingkun   

  1. School of Electrical and Information Engineering, Northeast Petroleum University, Daqing 163318, China
  • Received:2025-03-08 Online:2025-04-08 Published:2025-04-09

Abstract:

A self-mixing interferometer based on microsphere superlens and edge filter is proposed to solve the problems of complex structure and large error of microvibration detection equipment. UV( Ultraviolet Curing Adhesive) glue is used to form a microsphere at the tip of the optical fiber probe. When the microsphere is irradiated by the optical fiber, PNJ(Photon Nanojet) phenomenon will appear. PNJ focuses on the surface of the target object to enhance the reflected light of the target object to the surface of the microsphere. The evanescent field generated by the photon nanojet plays an important role in enhancing and sharpening the nanovibration detection on the near-field surface. The amplitude modulated signal is converted into frequency modulated signal by Mach-Zender edge filter at the end of the sensor, and the signal-to-noise ratio is increased. Experimental results show that the reconstruction error of this method is 27 nm, which is of great significance for the miniaturization of optical devices.

Key words: vibration detection, photon nanojet, mahzindel edge filter, self-mixing interference

CLC Number: 

  • TN929. 11