Compact millimeter-wavelength Fourier-transform spectrometer

Pan, Z.; Liu, Mira; Thakur, R. Basu; Benson, B. A.; Fixsen, D. J.; Goksu, Hazal; Rath, Eleanor; Meyer, S. S.

doi:10.1364/ao.58.006257

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…The FTS is designed to operate at wavelengths from 0.9-6 mm, and the design of the spectrometer itself is described in Ref. 15. The spectrometer, shown in Fig.…”

Section: Optical Characterizationmentioning

confidence: 99%

Characterization of aerogel scattering filters for astronomical telescopes

Barlis¹,

Arseneau²,

Bennett³

et al. 2022

Preprint

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We have developed a suite of novel infrared-blocking filters made by embedding scattering particles in a polymer aerogel substrate. Our developments allow us to tune the spectral performance of the filters based on both the composition of the base aerogel material and the properties of the scattering particles. Our filters are targeted for use in a variety of applications, from ground-based CMB experiments to planetary science probes. We summarize the formulations we have fabricated and tested to date, including several polyimide base aerogel formulations incorporating a range of size distributions of diamond scattering particles. We also describe the spectral characterization techniques used to measure the filters' optical properties, including the development of a mm-wave Fourier transform spectrometer testbed.

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“…The FTS is designed to operate at wavelengths from 0.9-6 mm, and the design of the spectrometer itself is described in Ref. 15. The spectrometer, shown in Fig.…”

Section: Optical Characterizationmentioning

confidence: 99%

Characterization of aerogel scattering filters for astronomical telescopes

Barlis¹,

Arseneau²,

Bennett³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The array-averaged band center and width are summarized in Table 6. The spectral response was measured in situ with a compact Fourier transform spectrometer (FTS), described in Pan et al (2018Pan et al ( , 2019. The measurement gives the SPT-3G receiver response to a beam-filling, flat-spectrum source at the receiver's vacuum window.…”

Section: Spectral Responsementioning

confidence: 99%

The Design and Integrated Performance of SPT-3G

Sobrin,

Anderson,

Bender

et al. 2021

Preprint

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SPT-3G is the third survey receiver operating on the South Pole Telescope dedicated to highresolution observations of the cosmic microwave background (CMB). Sensitive measurements of the temperature and polarization anisotropies of the CMB provide a powerful dataset for constraining cosmology. Additionally, CMB surveys with arcminute-scale resolution are capable of detecting galaxy clusters, millimeter-wave bright galaxies, and a variety of transient phenomena. The SPT-3G instrument provides a significant improvement in mapping speed over its predecessors, SPT-SZ and SPTpol. The broadband optics design of the instrument achieves a 430 mm diameter image plane across observing bands of 95 GHz, 150 GHz, and 220 GHz, with 1.2 arcmin FWHM beam response at 150 GHz. In the receiver, this image plane is populated with 2690 dual-polarization, tri-chroic pixels (∼16000 detectors) read out using a 68× digital frequency-domain multiplexing readout system. In 2018, SPT-3G began a multiyear survey of 1500 deg 2 of the southern sky. We summarize the unique optical, cryogenic, detector, and readout technologies employed in SPT-3G, and we report on the integrated performance of the instrument.

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“…The frequency resolution will be 1/∆τ max ∼1.4 GHz or 0.7 GHz for single and two-pass circuit designs. Standard optomechanical FTS with GHz resolution are meter-scale, whereas using this concept allows for a millimeter-scale SOFTS [23]. The physical path length and resolution could be increased while still keeping the area small compared to a pixel in a millimeter-wave imaging array.…”

Section: B Phase Delay and On-chip Interferometermentioning

confidence: 99%

Nonlinearity and wideband parametric amplification in an NbTiN microstrip transmission line

Shu,

Klimovich,

Eom

et al. 2021

Preprint

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The nonlinear response associated with the current dependence of the superconducting kinetic inductance was studied in capacitively shunted NbTiN microstrip transmission lines. It was found that the inductance per unit length of one microstrip line could be changed by up to 20% by applying a DC current, corresponding to a single pass time delay of 0.7 ns. To investigate nonlinear dissipation, Bragg reflectors were placed on either end of a section of this type of transmission line, creating resonances over a range of frequencies. From the change in the resonance linewidth and amplitude with DC current, the ratio of the reactive to the dissipative response of the line was found to be 788. The low dissipation makes these transmission lines suitable for a number of applications that are microwave and millimeter-wave band analogues of nonlinear optical processes. As an example, by applying a millimeter-wave pump tone, very wide band parametric amplification was observed between about 3 and 34 GHz. Use as a current variable delay line for an on-chip millimeter-wave Fourier transform spectrometer is also considered.

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Compact millimeter-wavelength Fourier-transform spectrometer

Cited by 12 publications

References 14 publications

Characterization of aerogel scattering filters for astronomical telescopes

Characterization of aerogel scattering filters for astronomical telescopes

The Design and Integrated Performance of SPT-3G

Nonlinearity and wideband parametric amplification in an NbTiN microstrip transmission line

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