Response Increase of IR Antenna-Coupled Thermocouple Using Impedance Matching

Krenz, Peter M.; Tiwari, B.; Szakmany, Gergo P.; Orlov, Alexei O.; González, Francisco; Boreman, Glenn D.; Porod, Wolfgang

doi:10.1109/jqe.2012.2189758

Cited by 42 publications

(20 citation statements)

References 18 publications

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“…Therefore, the normalized detectivity for a palladium-chromium device with the largest Seebeck coefficient out of the characterized devices was measured at 10.6 μm illumination and a maximum value of 1.94 × 10 5 cm · √ Hz/W was found. Other antenna-coupled thermocouples were previously fabricated and measured [14], but this is the first measured normalized detectivity of antennacoupled nanowire thermocouples. This value is similar to previously reported values for antenna-coupled bolometers that were fabricated in direct contact with their substrate [21].…”

Section: Discussionmentioning

confidence: 99%

“…The optical properties of the materials at 28.3 THz were found in [12], while the thermal properties of the materials were found in [13]. The thermal conductivity of the metals was reduced by the factor of three to approximate the property reduction due to size confinement of the nanowires forming the thermocouples [14]. The simulated temperature increase of the hot junction of the thermocouple due to illumination with 1.42 W/cm 2 is shown in Fig.…”

Section: Design and Fabricationmentioning

confidence: 99%

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Antenna-Coupled Nanowire Thermocouples for Infrared Detection

Szakmany

Krenz

Orlov

et al. 2013

IEEE Trans. Nanotechnology

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Unbiased, uncooled, and frequency-selective antenna-coupled nanowire thermocouples have been fabricated out of different metal combinations and characterized for infrared detection. The relative Seebeck coefficient of the nanowire thermocouples was measured with a characterization platform, which is colocated on the same chip as the detectors. The area of the hot junction of the nanowire thermocouple is approximately 75 nm × 75 nm. The antenna-coupled thermocouples show polarization dependence with a maximum normalized detectivity (D * ) of 1.94 × 10 5 cm · √ Hz/W.

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Section: Discussionmentioning

confidence: 99%

Section: Design and Fabricationmentioning

confidence: 99%

Antenna-Coupled Nanowire Thermocouples for Infrared Detection

Szakmany

Krenz

Orlov

et al. 2013

IEEE Trans. Nanotechnology

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“…Many methods have been investigated to increase the absorption of an infrared detector so far, including antireflection coatings [2,3], impedance matching [4], surface texturing [5], and resonant photonic structures [6] or plasmonics. Plasmonics is an emerging field that has found wide-spread applications such as photovoltaics [7], photothermal cancer therapy [8], single molecule biosensing [9], and infrared detectors [10].…”

Section: Introductionmentioning

confidence: 99%

Broadband absorption enhancement in an uncooled microbolometer infrared detector

et al. 2014

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This paper introduces a method for a broadband absorption enhancement in the LWIR range (8-12 μm), in single layer microbolometer pixels with 35 μm pitch. For the first time in the literature, this study introduces a very simple and low cost approach to enhance the absorption by embedding plasmonic structures at the same level as the already existing metallic layer of a microbolometer pixel. The metal layer comprises the electrode and the arm structures on the body. Even though the periodicity of the plasmonic structures is slightly disturbed by the placement of the electrodes and the connecting metal, the metal arms and the electrodes compensate for the lack of the periodicity contributing to the resonance by their coupling with the individual plasmonic resonators. Various plasmonic structures are designed with FDTD simulations. Individual, plasmonically modified microbolometer pixels are fabricated, and an increase in the average absorption due to surface plasmon excitation at Au/Si3N4 interfaces is observed. Plasmonic structures increase the average absorption from 78% to 82% and result in an overall enhancement of 5.1%. A good agreement between the simulation and the FTIR measurement results are obtained within the LWIR range. This work paves the way for integration of the plasmonic structures within conventional microbolometer devices for performance enhancement without introducing additional costs. © 2014 SPIE

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“…Through simulations, it is demonstrated that the input impedance of the nanoantennas can be matched to the transmission line impedance by varying the dipole's geometric parameters. In [5] a two wire transmission line of particular length attached to a dipole nanoantenna is connected to a thermocouple to achieve an improved impedance match. Those numerical simulation and experimental demonstration have paved a way to realize the maximum power transfer between the antenna and the load.…”

Section: Introductionmentioning

confidence: 99%

Efficient nanoantenna simulation for IR energy harvesting and detection devices

Choi

Sarabandi

2014

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)

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A novel nanoatenna is designed for enhancing an IR energy harvesting device and realization of a focal plane array polarimetric IR detector. Instead of using a bulk semiconductor material for photovoltaic detection, the semiconductor p-n junction is scaled down and loaded at the antenna's terminal where the antenna field enhancement can be utilized. For infrared (IR) devices, a low-band gap material, Indium Gallium Arsenide Antimonide (InGaAsSb) is used and its electrical properties are analyzed in order to optimize it as the antenna load. For maximum power transfer between the antenna and the load, the impedance matching is established by optimizing the antenna geometrical and material parameters as well as utilizing a reactive shunt transmission line stub. In numerical simulations, the Drude model for metal is incorporated in the FEM code to account for plasmonic effects. Also to match the antenna to high load impedance, the antenna is operated at its anti-resonance mode. It is shown that the antenna loaded with InGaAsSb can present a field enhancement as high as 23.5 in a near-IR band. The performance of the IR harvesting device in terms of absorption efficiency is enhanced by 50%. Also the detectivity of the uncooled-IR detecting device made by such antenna and load is improved by a factor equal to the field enhancement factor (~23).

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Response Increase of IR Antenna-Coupled Thermocouple Using Impedance Matching

Cited by 42 publications

References 18 publications

Antenna-Coupled Nanowire Thermocouples for Infrared Detection

Antenna-Coupled Nanowire Thermocouples for Infrared Detection

Broadband absorption enhancement in an uncooled microbolometer infrared detector

Efficient nanoantenna simulation for IR energy harvesting and detection devices

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