Radiation heat transfer dominated microbolometers

Gawarikar, Anand S.; Shea, Ryan P.; Mehdaoui, A.; Talghader, Joseph J.

doi:10.1109/omems.2008.4607887

Cited by 5 publications

(10 citation statements)

References 3 publications

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“…[ 160 , 161 ] Additionally, various components have been integrated into the composition of microbolometers in order to add elements of spectral sensitivity. For example, narrow antenna coupling, [ 162 ] metal grids, [ 163 ] and SiO 2 absorbing fi lms [ 164 ] are all techniques that have been utilized.…”

Section: Detection and Sensingmentioning

confidence: 99%

Metamaterial Electromagnetic Wave Absorbers

2012

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The advent of negative index materials has spawned extensive research into metamaterials over the past decade. Metamaterials are attractive not only for their exotic electromagnetic properties, but also their promise for applications. A particular branch–the metamaterial perfect absorber (MPA)–has garnered interest due to the fact that it can achieve unity absorptivity of electromagnetic waves. Since its first experimental demonstration in 2008, the MPA has progressed significantly with designs shown across the electromagnetic spectrum, from microwave to optical. In this Progress Report we give an overview of the field and discuss a selection of examples and related applications. The ability of the MPA to exhibit extreme performance flexibility will be discussed and the theory underlying their operation and limitations will be established. Insight is given into what we can expect from this rapidly expanding field and future challenges will be addressed.

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Section: Detection and Sensingmentioning

confidence: 99%

Metamaterial Electromagnetic Wave Absorbers

2012

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“…This arises from the reduced thermal conductance, which has been measured in recent thin film devices. 20 The effects of photon emission and absorption on the energy fluctuations are the same by Kirchoff 's Law, and the similarity applies for light of any particular wavelength range, polarization or direction.…”

Section: Radiation Noisementioning

confidence: 95%

“…The simulation shows an absorption of greater than 50% in the 8-14 mm range. The simulation is done using the 232 matrix technique from Yeh 20 and optical constants from Palik.…”

Section: Broadband Thermal Detector Technology Flat Spectrummentioning

confidence: 99%

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Spectral selectivity in infrared thermal detection

2012

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A review is made of the physics and technology of spectrally selective thermal detectors, especially those operating at non-cryogenic temperatures. The background radiation noise fluctuations are rederived for arbitrary spectral characteristics. Infrared absorption due to phonons and free carriers is discussed followed by a review of published works on artificial infrared absorption materials such as patterned grids, nanoparticles, plasmonic structures, metamaterials and others. Subsequently, the literature of the spectral characteristics of broadband thermal detectors and spectrally selective thermal detectors is reviewed. Finally, the authors speculate on the directions that future research and development in the area will take regarding architectures, sensitivity and spectral characteristics.

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“…This can include both phonon fluctuations through the support structure and photon fluctuations through emission and absorption in the plate. While historically thermal conductance noise has been dominated by conduction through the legs, recent work has shown that with proper engineering, bolometers can be fabricated for which radiation is the principal thermal conductance path [12].…”

Section: Practical Device Designmentioning

confidence: 99%

Midwave thermal infrared detection using semiconductor selective absorption

Shea¹,

Gawarikar²,

Talghader³

2010

Opt. Express

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The performance of thermal detectors is derived for devices incorporating materials with non-uniform spectral absorption. A detector designed to have low absorption in the primary thermal emission band at a given temperature will have a background-limited radiation noise well below that of a blackbody absorber, which is the condition typically assessed for ultimate thermal detector performance. Specific examples of mid-wave infrared (ʎ ∼ 3-5 μm) devices are described using lead selenide as a primary absorber with optical cavity layers that maximize coupling. An analysis of all significant noise sources is presented for two example room-temperature devices designed to have detectivities up to 4.37 × 10(10) cm Hz(1/2) W(-1), which is a factor 3.1 greater than the traditional blackbody limit. An alternative method of fabricating spectrally selective devices by patterning a plasmonic structure in silver is also considered.

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Radiation heat transfer dominated microbolometers

Cited by 5 publications

References 3 publications

Metamaterial Electromagnetic Wave Absorbers

Metamaterial Electromagnetic Wave Absorbers

Spectral selectivity in infrared thermal detection

Midwave thermal infrared detection using semiconductor selective absorption

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