Frequency Modulation and Absorption Improvement of THz Micro-bolometer with Micro-bridge Structure by Spiral-Type Antennas

Gou, Jun; Niu, Qingchen; Liang, Kai; Wang, Jun; Jiang, Yadong

doi:10.1186/s11671-018-2484-7

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…At this scale, contemporary solutions are numerous: from antenna structures 11,[15][16][17] to metamaterials [18][19][20] , which promise absorptivities up to 100% but are always limited by their resonance bandwidth. A progressive solution to improve the spectral range of detection has been to use a stack of plasmonic structures with differing lateral size; nonetheless, the bandwidth of these sensors remains limited e.g., from 0.8 to 1.3 THz 21 .…”

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confidence: 99%

Ultrathin 2 nm gold as impedance-matched absorber for infrared light

et al. 2020

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Thermal detectors are a cornerstone of infrared and terahertz technology due to their broad spectral range. These detectors call for efficient absorbers with a broad spectral response and minimal thermal mass. A common approach is based on impedance-matching the sheet resistance of a thin metallic film to half the free-space impedance. Thereby, one can achieve a wavelength-independent absorptivity of up to 50%. However, existing absorber films typically require a thickness of the order of tens of nanometers, which can significantly deteriorate the response of a thermal transducer. Here, we present the application of ultrathin gold (2 nm) on top of a surfactant layer of oxidized copper as an effective infrared absorber. An almost wavelength-independent and long-time stable absorptivity of 47(3)%, ranging from 2 μm to 20 μm, can be obtained. The presented absorber allows for a significant improvement of infrared/terahertz technologies in general and thermal detectors in particular.

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Ultrathin 2 nm gold as impedance-matched absorber for infrared light

et al. 2020

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“…At this scale, contemporary solutions are numerous: from novel antenna structures [2,3,21,22] to metamaterials [23][24][25], which promise a high absorptivity but are limited by their resonance bandwidth. A progressive solution to improve the spectral range of detection has been to use a stack of plasmonic structures with differing lateral size; nonetheless, the bandwidth of these sensors remains limited [1].…”

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confidence: 99%

Ultrathin 2 nm gold as ideal impedance-matched absorber for infrared light

Luhmann,

Høj,

Piller

et al. 2019

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Thermal detectors are a cornerstone of infrared (IR) and terahertz (THz) technology due to their broad spectral range. These detectors call for suitable broad spectral absorbers with minimal thermal mass. Often this is realized by plasmonic absorbers, which ensure a high absorptivity but only for a narrow spectral band [1][2][3]. Alternativly, a common approach is based on impedancematching the sheet resistance of a thin metallic film to half the free-space impedance. Thereby, it is possible to achieve a wavelength-independent absorptivity of up to 50 %, depending on the dielectric properties of the underlying substrate [4][5][6]. However, existing absorber films typically require a thickness of the order of tens of nanometers, such as titanium nitride (14 nm) [7], which can significantly deteriorate the response of a thermal transducers. Here, we present the application of ultrathin gold (2 nm) on top of a 1.2 nm copper oxide seed layer as an effective IR absorber. An almost wavelength-independent and long-time stable absorptivity of ∼47(3) %, ranging from 2 µm to 20 µm, could be obtained and is further discussed. The presented gold thin-film represents an almost ideal impedance-matched IR absorber that allows a significant improvement of state-of-theart thermal detector technology.

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