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

Mariangela Baggio*, Aleksi Tamminen, Juha Ala-Laurinaho, Zachary Taylor

*Corresponding author for this work

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

1 Citation (Scopus)
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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
ISBN (Electronic)978-88-31299-04-6
ISBN (Print)978-1-6654-1604-7
Publication statusPublished - 2022
MoE publication typeA4 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


ConferenceEuropean Conference on Antennas and Propagation
Abbreviated titleEuCAP
Internet address


  • cornea sensing
  • Schwarzschild objective
  • submillimeter waves


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