Superconducting detectors in astronomy

Rahman, Faiz

doi:10.1080/00107510600861389

Cited by 8 publications

(2 citation statements)

References 107 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5, we present the measured value of IR response before and after coating. According to (2), since both measurements are done at the same bias current and chopping frequency, the following relation, which is based on dR/dT and surface absorption, can be used to derive the responsivity variations:…”

Section: B Coatingmentioning

confidence: 99%

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Moftakharzadeh

Kokabi

Bozbey

et al. 2009

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Bolometric response and noise characteristics of YBCO superconductor transition edge IR detectors with relatively sharp transition and its resulting detectivity are investigated both theoretically and experimentally. The magnitude of response of a fabricated device was obtained for different bias currents and modulation frequencies. Using the measured and calculated bolometric response and noise characteristics, we found and analyzed the device detectivity versus frequency for different bias currents. The detectivity versus chopping frequency of the device did not decrease following the response strongly, due to the decrease of the noise at higher frequencies up to 1 kHz, resulting in maximum detectivity around the modulation frequency of 100 Hz. We also improved the responsivity of the device through the increase of the surface absorption by using a novel infrared absorber, which is made of a copper-carbon composite, coated in a low-temperature process. Within the modulation frequency range studied in this paper, comparison of device detectivity before and after coating is also presented.Index Terms-Detectivity, infrared absorber, transition edge sensor (TES).

show abstract

Section: B Coatingmentioning

confidence: 99%

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Moftakharzadeh

Kokabi

Bozbey

et al. 2009

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…In some specific environments, such as most highly sensitive THz detectors, some solid-state THz sources, and superconducting (SC) hotelectron bolometers (HEB) in astronomical observation, operations in cryogenic dewars are always required. [10][11][12] However, existing THz modulators that can operate at low temperatures are still relatively lacking. In a cryogenic dewar environment, the modulation of the signal requires an external mechanical chopper, which greatly increases the complexity and does not facilitate system integration.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Complementary Metamaterial‐Based Switchable Device for Terahertz Wave Manipulation

Teng

Chen

et al. 2023

Physica Status Solidi (b)

View full text Add to dashboard Cite

Herein, a tunable superconducting switch that can modulate terahertz waves is designed and experimentally demonstrated. The switchable device consists of two symmetrical split ring resonator antistructures made from niobium nitride film in one unit cell. The relatively high modulation depths of 88.5% can be obtained at resonance peaks of 0.328 THz by applying a very low bias voltage of 0.8 V. Due to the presence of higher‐order resonance modes, the superconducting device also demonstrates a multiband tuning ability at 1.03 and 1.16 THz. To further analyze the modulation mechanism of the superconducting device, the temperature dependence of the switchable device is also measured. The trends of conductivity change are calculated based on the Bardeen–Cooper–Schrieffer theory and the simulations agree well with the experimental results. During the experiment, this device not only owns a good switching capability but also shows significant frequency selective bandpass characteristics. This study delivers a promising approach for designing active and miniaturized devices, especially for applications in THz cryogenic systems.

show abstract

Electrically terahertz switchable device based on superconducting composite structure metamaterial

Teng

Duan

et al. 2022

Applied Physics Letters

View full text Add to dashboard Cite

In this work, we experimentally demonstrate an electrically tunable superconducting composite structure metamaterial capable of modulating terahertz (THz) waves. Compared with other superconducting switching devices, our device is composed of golden structures and niobium nitride (NbN) film junctions together. Its unique structural characteristics allow our device to achieve relatively large amplitude modulation effects with the smallest superconducting films. With a 4 V bias voltage, a modulation depth of 73.8% for this switch can be achieved at 0.308 THz. The experimental results agree well with the simulations. To better illustrate the physical mechanism behind the resonance mode transition, a hybrid coupling model was introduced. Our work provides an alternative tuning method and delivers a promising approach for designing active and miniaturized devices in THz cryogenic systems.

show abstract

Superconducting detectors in astronomy

Cited by 8 publications

References 107 publications

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Superconducting Complementary Metamaterial‐Based Switchable Device for Terahertz Wave Manipulation

Electrically terahertz switchable device based on superconducting composite structure metamaterial

Contact Info

Product

Resources

About