Second order interference of chaotic light reflected from random medium

TL;DR

This paper investigates second order interference effects of chaotic light reflected from a random medium, revealing a peak in correlation at the reflection angle equal to the incidence angle under certain conditions.

Contribution

It demonstrates that second order correlation functions can exhibit a peak at the reflection angle matching the incidence angle when collecting light from a region larger than the coherence length.

Findings

Second order correlation peaks at the reflection angle equal to the incidence angle.

The effect occurs when the collection region exceeds the coherence length.

Reflection from a random medium can produce measurable second order interference.

Abstract

We consider the reflection from a random medium of light with short coherence length. We found that the second order correlation function of light can have a peak in a direction where the reflection angle is equal to angle of incidence. This occurs when the size of the region, from which light is collected, is larger than the coherence length.