Quasi-Optical LO Coupling Validation for a Planarly Integrated 2 × 2 Pixel Heterodyne Array at 1.95 THz

Conference paper (2023)

Authors

S. L. van Berkel California Institute of Technology
A. Maestrini California Institute of Technology
G. Chattopadhyay California Institute of Technology
C. Jung-Kubiak California Institute of Technology
S. Bosma Tera-Hertz Sensing - EEMCS
M. Alonso Del Pino Tera-Hertz Sensing - EEMCS
D. Hayton California Institute of Technology
Jacob Kooi California Institute of Technology
J. V. Siles California Institute of Technology
Nuria Llombart Tera-Hertz Sensing - EEMCS
I. Mehdi California Institute of Technology
Research Group
Tera-Hertz Sensing (EEMCS) (TU Delft)
Copyright: © 2023 S. L. van Berkel, A. Maestrini, C. Jung-Kubiak, S. Bosma, M. Alonso Del Pino, D. Hayton, Jacob Kooi, J. V. Siles, Nuria Llombart, I. Mehdi, G. Chattopadhyay
DOI
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https://doi.org/10.1109/IRMMW-THz57677.2023.10299120
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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Tera-Hertz Sensing

Abstract

Terahertz heterodyne spectrometer instruments have been traditionally limited to a single pixel or a handful of pixels due to integration and assembly constraints and a limited availability of local oscillator (LO) power. As a solution we propose a novel silicon-micromachined planar and modular packaging strategy, that will allow for a dense integration of a large number of pixels. Moreover, the RF- and LO signals will be quasi-optically coupled via two identical but opposite lens arrays, such that a single LO-source can efficiently pump all HEB-mixers of the 2x2 pixel demonstrator array simultaneously. This work reports on an intermediate step, where we validate the lens array performance and LO power coupling efficiency, by slightly modifying the silicon package into a transmit array configuration. In this way, the LO power coupled into the stack is directly reradiated on the other side, which is then measured using a liquid helium cooled bolometer.