A novel scheme for measuring the relative phase difference between S and P polarization in optically denser medium

TL;DR

This paper introduces a new optical setup using a monolithic folded Fabry-Perot cavity to measure the relative phase difference between S and P polarizations in denser media by analyzing frequency shifts of resonances.

Contribution

The paper presents a novel method for measuring phase differences in optically denser media beyond the range of traditional ellipsometry using frequency shifts in a specialized cavity.

Findings

Relative frequency shift of ~1.030 GHz for confocal cavity

Relative frequency shift of ~0.387 GHz for parallel cavity

Inferred phase differences of -167.4° and -201.1° for different cavity types

Abstract

We demonstrate applications of a novel setup which is used for measuring relative phase difference between S and P polarization at oblique incidence point in optically denser medium by analyzing the relative frequency shift of adjacent axial modes of S and P resonances of a monolithic folded Fabry-Perot cavity (MFC). The relative frequency shift of adjacent axial modes of S and P resonances of MFC is around 1.030 GHz for the confocal MFC cavity and 0.3869 GHz for the parallel MFC cavity respectively. The relative phase difference at reflection point A in optically denser medium is inferred to be around -167.4{\deg} for confocal cavity and -201.1{\deg} for parallel cavity separately. This scheme can be used to measure the relative phase difference in optically denser mediums which is out of measuring range of Ellipsometry.