Programmable multiport optical circuits in opaque scattering materials

TL;DR

This paper introduces a method to program multiport optical circuits within opaque scattering materials using phase modulation, enabling precise control without complex measurements, demonstrated in white paint layers.

Contribution

The authors present a deterministic wavefront-shaping technique to program multiport optical circuits in scattering media without measuring the transmission matrix.

Findings

Successfully programmed 2x2 and 2x3 optical circuits in white paint layers.

Verified phase relations between outputs using interferometric techniques.

Method works with existing setups without transmission matrix measurement.

Abstract

We propose and experimentally verify a method to program the effective transmission matrix of general multiport linear optical circuits in random multiple-scattering materials by phase modulation of incident wavefronts. We demonstrate the power of our method by programming linear optical circuits in white paint layers with 2 inputs and 2 outputs, and 2 inputs and 3 outputs. Using interferometric techniques we verify our ability to program any desired phase relation between the outputs. The method works in a deterministic manner and can be directly applied to existing wavefront-shaping setups without the need of measuring a transmission matrix or to rely on sensitive interference measurements.