Dichroic Filter Characterizations

TL;DR

This paper provides detailed measurements and modeling of dichroic filters used in photon detection, including their optical properties in different media and angles, aiding in detector simulation development.

Contribution

It introduces comprehensive characterization data of dichroic filters in various media and demonstrates a modified Bragg's Law model for transmission edge shifts with incidence angle.

Findings

Modified Bragg's Law accurately models transmission edge shifts.

Transmission and reflection properties vary with media and angle.

Data supports improved optical modeling for detector simulations.

Abstract

We present here measurements and characterizations of several dichroic filters, which are being used more commonly in nuclear and particle physics for photon-detection. The measurements were performed on filters immersed in several media: air, water, and LAB-based liquid scintillator. Measurements of transmission and reflection properties were made at various angles of incidence, and the data presented here can be used to develop detailed optical models for detector simulations. We find a modified Bragg's Law is a good model for the shift in transmission edge as a function of angle of incidence, across the various media.