Optical modeling of waveguide coupled TES detectors towards the SAFARI instrument for SPICA

Trappe, N.; Bracken, Colm; Doherty, Stephen; Gao, J. R.; Glowacka, D.; Goldie, D. J.; Griffin, Douglas; Hijmering, R. A.; Jackson, B. D.; Khosropanah, P.; Mauskopf, Philip Daniel; Morozov, D.; Murphy, A.; O'Sullivan, Créidhe M.; Ridder, M.; Withington, S.

doi:10.1117/12.926760

Cited by 6 publications

(5 citation statements)

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“…If we assume that only a single mode propagates, we find that the apparent optical efficiency is a factor of about 1.5 higher for the large aperture than for the smallest pinhole. The estimate of 60% for the optical efficiency is more consistent with the predicted ideal-case efficiency of 70% 21,22 .…”

Section: B Measurements With Spatial Mode Filteringsupporting

confidence: 74%

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Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared

Audley

Lange

Gao

et al. 2016

Review of Scientific Instruments

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The next generation of far infrared space observatories will require extremely sensitive detectors that can be realized only by combining extremely low intrinsic noise with high optical efficiency. We have measured the broad-band optical response of ultra-sensitive transtion edge sensor (TES) bolometers (NEP≈2aW/Hz) in the 30-60-μm band where radiation is coupled to the detectors with a few-moded conical feedhorn and a hemispherical backshort. We show that these detectors have an optical efficiency of 60% (the ratio of the power detected by the TES bolometer to the total power propagating through the feedhorn). We find that the measured optical efficiency can be understood in terms of the modes propagating through the feedhorn with the aid of a spatial mode-filtering technique.

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Section: B Measurements With Spatial Mode Filteringsupporting

confidence: 74%

“…A pair of high-pass/low-pass filters is mounted on the entrance aperture of the horn. This optical coupling scheme has been modelled extensively [20][21][22] and is expected to have an ideal-case optical efficiency of about 70%.…”

Section: A Detectorsmentioning

confidence: 99%

Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared

Audley

Lange

Gao

et al. 2016

Review of Scientific Instruments

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“…Overall scattering matrices are constructed which represent either the modal power transmitted through the entire system (S 21 ), or the return modal power (S 11 ). The behaviour of the resistive absorber sheet can also be included by defining special boundary conditions for the integrals at the plane where the absorber is positioned [23,24]. An analysis of the total return power (which would be unity for an empty cavity, and less than unity if there is an absorber present) can then be used to deduce the amount of power absorbed by the Ta.…”

Section: Mode-matching Modelmentioning

confidence: 99%

A novel, highly efficient cavity backshort design for far-infrared TES detectors

Bracken

Lange

Audley

et al. 2018

Infrared Physics & Technology

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“…There are two approaches to calculating the scattering parameters of patterned films in multimode waveguide: (i) a Green's Dyadic Method (GDM), [5] which uses a MoM-like approach in a waveguide environment; (ii) Boundary Matching Method (BMM) [6] where the jump conditions associated with the sheet impedance are used to match the waveguide mode coefficients on either side of a film. It can be proven analytically that these two methods are identical [4].…”

Section: Mode Matchingmentioning

confidence: 99%

Partially Coherent Optical Modelling of the Ultra-Low-Noise Far-Infrared Imaging Arrays on the SPICA Mission

Withington,

Thomas,

Goldie

2013

Preprint

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We have developed a range of theoretical and numerical techniques for modeling the multi-mode, 210-34 µm, ultra-low-noise Transition Edge Sensors that will be used on the SAFARI instrument on the ESA/JAXA cooled-aperture FIR space telescope SPICA. The models include a detailed analysis of the resistive and reactive properties of thin superconducting absorbing films, and a partially coherent mode-matching analysis of patterned films in multi-mode waveguide. The technique allows the natural optical modes, modal responsivities, and Stokes maps of complicated structures comprising patterned films in profiled waveguides and cavities to be determined.

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Optical modeling of waveguide coupled TES detectors towards the SAFARI instrument for SPICA

Cited by 6 publications

References 0 publications

Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared

Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared

A novel, highly efficient cavity backshort design for far-infrared TES detectors

Partially Coherent Optical Modelling of the Ultra-Low-Noise Far-Infrared Imaging Arrays on the SPICA Mission

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