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

Mariangela Baggio; Aleksi Tamminen; Juha Ala-Laurinaho; Zachary Taylor

doi:10.23919/EuCAP53622.2022.9769685

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 proceeding › Conference article in proceedings › Scientific › peer-review

2 Citations (Scopus)

92 Downloads (Pure)

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 language	English
Title of host publication	2022 16th European Conference on Antennas and Propagation, EuCAP 2022
Publisher	IEEE
ISBN (Print)	978-1-6654-1604-7
DOIs	https://doi.org/10.23919/EuCAP53622.2022.9769685
Publication status	Published - 2022
MoE publication type	A4 Conference publication
Event	European Conference on Antennas and Propagation - Madrid, Spain Duration: 27 Mar 2022 → 1 Apr 2022 Conference number: 16 https://www.eucap2022.org/

Publication series

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

Conference

Conference	European Conference on Antennas and Propagation
Abbreviated title	EuCAP
Country/Territory	Spain
City	Madrid
Period	27/03/2022 → 01/04/2022
Internet address	https://www.eucap2022.org/

Funding

The calculations presented above were performed using computer resources within the Aalto University School of Science “Science-IT”. This work is funded by Academy of Finland RADDESS programme (project AGRUM, decision number 327640).

Keywords

cornea sensing
Schwarzschild objective
submillimeter waves

Access to Document

10.23919/EuCAP53622.2022.9769685

Design_of_double-reflector_objective_for_corneal_sensing_in_the_220__330_GHz_bandAccepted author manuscript, 404 KB

Cite this

@inproceedings{89d82884bf77463c96c817febd07bc0f,

title = "Design of double-reflector objective for corneal sensing in the 220-330 GHz band",

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. ",

keywords = "cornea sensing, Schwarzschild objective, submillimeter waves",

author = "Mariangela Baggio and Aleksi Tamminen and Juha Ala-Laurinaho and Zachary Taylor",

note = "Funding Information: The calculations presented above were performed using computer resources within the Aalto University School of Science {\textquotedblleft}Science-IT{\textquotedblright}. This work is funded by Academy of Finland RADDESS programme (project AGRUM, decision number 327640). Publisher Copyright: {\textcopyright} 2022 European Association for Antennas and Propagation.; European Conference on Antennas and Propagation, EuCAP ; Conference date: 27-03-2022 Through 01-04-2022",

year = "2022",

doi = "10.23919/EuCAP53622.2022.9769685",

language = "English",

isbn = "978-1-6654-1604-7",

series = "Proceedings of the European Conference on Antennas and Propagation",

publisher = "IEEE",

booktitle = "2022 16th European Conference on Antennas and Propagation, EuCAP 2022",

address = "United States",

url = "https://www.eucap2022.org/",

}

Baggio, M, Tamminen, A , Ala-Laurinaho, J & Taylor, Z 2022, Design of double-reflector objective for corneal sensing in the 220-330 GHz band. in 2022 16th European Conference on Antennas and Propagation, EuCAP 2022. Proceedings of the European Conference on Antennas and Propagation, IEEE, European Conference on Antennas and Propagation, Madrid, Spain, 27/03/2022. https://doi.org/10.23919/EuCAP53622.2022.9769685

Design of double-reflector objective for corneal sensing in the 220-330 GHz band. / Baggio, Mariangela; Tamminen, Aleksi ; Ala-Laurinaho, Juha et al.
2022 16th European Conference on Antennas and Propagation, EuCAP 2022. IEEE, 2022. (Proceedings of the European Conference on Antennas and Propagation).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Design of double-reflector objective for corneal sensing in the 220-330 GHz band

AU - Baggio, Mariangela

AU - Tamminen, Aleksi

AU - Ala-Laurinaho, Juha

AU - Taylor, Zachary

N1 - Conference code: 16

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

KW - cornea sensing

KW - Schwarzschild objective

KW - submillimeter waves

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DO - 10.23919/EuCAP53622.2022.9769685

M3 - Conference article in proceedings

AN - SCOPUS:85130626278

SN - 978-1-6654-1604-7

T3 - Proceedings of the European Conference on Antennas and Propagation

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T2 - European Conference on Antennas and Propagation

Y2 - 27 March 2022 through 1 April 2022

ER -

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

Abstract

Publication series

Conference

Funding

Keywords

Access to Document

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Fingerprint

AGRUM: Assessment of the Graft Rejection Using Millimeter Waves

Science-IT

Cite this

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

Abstract

Publication series

Conference

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Projects

AGRUM: Assessment of the Graft Rejection Using Millimeter Waves

Equipment

Science-IT

Cite this