Share Email Print
cover

Proceedings Paper

Focusing light through scattering media by polarization modulation based generalized digital optical phase conjugation (Conference Presentation)

Paper Abstract

Focusing light deep inside and through thick biological tissue is critical to many applications. However, optical scattering prevents light from being focused through thick biological tissue, which restricts biophotonics to a limited depth of about 1 mm. To break this optical diffusion limit, digital optical phase conjugation (DOPC) based wavefront shaping techniques are being actively developed. Previous DOPC systems employed spatial light modulators that modulated either the phase or the amplitude of the conjugate light field. Here, we achieve optical focusing through scattering media by using polarization modulation based generalized DOPC. First, we describe an algorithm to extract the polarization map from the measured scattered field. Then, we validate the algorithm through numerical simulations, and find the focusing contrast achieved by polarization modulation is similar to that achieved by phase modulation, and is higher than those achieved by binary-phase and binary-amplitude modulations. Finally, we build a system using an inexpensive twisted nematic liquid crystal based spatial light modulator, and experimentally demonstrate light focusing through 3-mm thick chicken breast tissue. Since the polarization modulation based SLMs are widely used in displays and are having more and more pixel counts with the prevalence of 4K displays, these SLMs are inexpensive and valuable devices for wavefront shaping. Thus, we anticipate that polarization modulation based SLMs will gain their prevalence in the field of wavefront shaping.

Paper Details

Date Published: 14 March 2018
PDF
Proc. SPIE 10502, Adaptive Optics and Wavefront Control for Biological Systems IV, 105020L (14 March 2018); doi: 10.1117/12.2287467
Show Author Affiliations
Jiamiao Yang, California Institute of Technology (United States)
Washington Univ. in St. Louis (United States)
Yuecheng Shen, California Institute of Technology (United States)
Washington Univ. in St. Louis (United States)
Yan Liu, Washington Univ. in St. Louis (United States)
Ashton Hemphill, California Institute of Technology (United States)
Washington Univ. in St. Louis (United States)
Lihong Wang, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 10502:
Adaptive Optics and Wavefront Control for Biological Systems IV
Thomas G. Bifano; Joel Kubby; Sylvain Gigan, Editor(s)

© SPIE. Terms of Use
Back to Top