Design of double-reflector objective for corneal sensing in the 220-330 GHz band

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

An all reflective, Schwarzschild objective design for corneal reflectometry is evaluated in the WR3.4 (220-330 GHz) frequency band. The shadow created by the 60-mm diameter secondary mirror is sufficiently large to mount a standard, OCT system to enable concomitant data acquisition with both modalities while avoiding beam obscuration. The system was fed with a bottle beam comprised of a p= 0, ell = 4 Laguerre-Gaussian mode with a 12.5-mm beam waist radius for increased throughput. The 50-mm focal length system was determined with ray tracing and simulated with an in-house physical optics code using a PEC sphere as a test target. The power coupling coefficient between the feed beam and scattered beam varied from 0.35 at 220 GHz to 0.48 at 330 GHz. While the system demonstrated a clear phase center at less than 1 λ from the geometric focal point, significant edge diffraction prevents the formation of a spherical phasefront, which is needed to achieve phase front matching.

Original languageEnglish
Title of host publication2022 16th European Conference on Antennas and Propagation, EuCAP 2022
PublisherIEEE
ISBN (Electronic)9788831299046
DOIs
Publication statusPublished - 2022
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Antennas and Propagation - Madrid, Spain
Duration: 27 Mar 20221 Apr 2022
Conference number: 16

Publication series

NameProceedings of the European Conference on Antennas and Propagation
ISSN (Print)2164-3342

Conference

ConferenceEuropean Conference on Antennas and Propagation
Abbreviated titleEuCAP
Country/TerritorySpain
CityMadrid
Period27/03/202201/04/2022

Keywords

  • cornea sensing
  • Schwarzschild objective
  • submillimeter waves

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