Quasi-optical system for the DESHIMA spectrometer

Title

Quasi-optical system for the DESHIMA spectrometer

 Author

Bosma, Sjoerd (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Microelectronics)

Contributor

Llombart Juan, Nuria (mentor)
Endo, Akira (graduation committee)
Yurduseven, Ozan (graduation committee)
Adam, Aurele (graduation committee)

Degree granting institution

Delft University of Technology

 Programme

Electrical Engineering

 Project

DESHIMA

 Date

2017-08-25

 Abstract

DESHIMA is a superconducting on-chip spectrometer using MKIDs in the sub-mm wavelength regime (240-720 GHz, 1:3 bandwidth). This thesis presents (1) an analysis of the quasi-optical system used for DESHIMA on the ASTE telescope in Chile (2) design of the room-temperature optics of this design and (3) a preliminary investigation into an ultra-wideband leaky-lens antenna suitable for multi-pixel, constant aperture efficiency operation to be used as a feed to high f-number (>2) reflectors. The designed and analyzed optics show good performance and tolerance for the fall 2017 campaign of DESHIMA-on-ASTE. The wideband investigation leads to constant, >70% optical efficiency over the 1:3 bandwidth for a single pixel design (f-num=3.7) or >55% optical efficiency with multiple pixels spaced at 2*\lambda*f-number (f-num=5). Future work must be done to optimize the radiation efficiency of the antenna over the whole bandwidth, which is now the largest obstacle to frequency-dispersion free aperture efficiency.

 Subject

quasi optics
spectrometer
DESHIMA
wideband antenna
leaky lens
terahertz
astronomy
ASTE telescope
sub-mm
aperture efficiency

 To reference this document use:

http://resolver.tudelft.nl/uuid:8016c2e7-31ab-449a-beea-f1449a32cca0

 Part of collection

Student theses

 Document type

master thesis

 Rights

© 2017 Sjoerd Bosma
Files
PDF thesis_draft.pdf 5.01 MB
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