Particle manipulation behind turbid medium based on intensity transmission matrix

TL;DR

This paper introduces the intensity transmission matrix (ITM), a new wavefront shaping method that enables efficient, high-precision particle manipulation behind scattering media with reduced measurement time and expanded range.

Contribution

The paper presents the ITM, a novel approach relying solely on intensity measurements, significantly reducing measurement time and avoiding diffraction energy loss for particle manipulation.

Findings

ITM reduces measurement time to about 1/4 of traditional methods.

ITM enables manipulation over a range 20 times larger than the memory effect.

Successful manipulation of single and multiple particles behind scattering media.

Abstract

Optical tweezers can manipulate tiny particles. However, the distortion caused by the scattering medium restricts the applications of optical tweezers. Wavefront shaping techniques including the transmission matrix (TM) method are powerful tools to achieve light focusing behind the scattering medium. In this paper, we propose a new kind of TM, named intensity transmission matrix (ITM). Only relying on the intensity distribution, we can calculate the ITM with only about 1/4 measurement time of the widely used four-phase method. Meanwhile, ITM method can avoid the energy loss in diffraction introduced by holographic modulation. Based on the ITM, we have implemented particle manipulation with a high degree of freedom on single and multiple particles. In addition, the manipulation range is enlarged over twenty times (compared with the memory effect) to 200 {\mu}m.