Infrared dipole-coupled bolometer response on a hemispherical silicon immersion lens

Lail, Brian A.; Middlebrook, Christopher; Krenz, Peter M.; Boreman, Glenn D.

doi:10.1016/j.infrared.2009.03.001

Cited by 3 publications

(9 citation statements)

References 3 publications

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“…In Fig. 4, the theoretical broadside gain is plotted for both an uncoated and AR coated lens [3]. For the uncoated germanium lens with permittivity e r;Ge ¼ 16; the measured gain was 3.6 ± 0.2 in good agreement with the theoretical value of 4.…”

Section: Figuresupporting

confidence: 62%

“…The laser was modulated at 2.5 kHz using a mechanical chopper and a bias voltage of 100 mV DC was applied across the antenna [3]. The output signal from the device was measured using a lock in amplifier and a computer with LABVIEW.…”

Section: Methodsmentioning

confidence: 99%

“…Infrared dipole-coupled bolometers exhibit significant signal gain when illuminated through a high permittivity, AR coated hemispherical immersion lens [1][2][3][4]. In this context, the gain C, or irradiance responsivity ratio, is defined as the ratio between the antenna response when illuminated through the substrate to the response when illuminated from the air-side, and is given by the expression…”

Section: Introductionmentioning

confidence: 99%

“…When the curved surface of the immersion lens is not AR coated, the gain decreases dramatically. For example, a germanium lens with a permittivity of e r;Ge ¼ 16 in the 10 lm infrared region will generate a broadside signal gain of e 3=2 r;Ge ¼ 64 for a perfectly AR coated lens or a gain of e 1=2 r;Ge ¼ 4 for an uncoated lens [3]. In order to maintain the large signal gain for all illumination angles, the AR coat must be uniform over the hemispherical surface.…”

Section: Introductionmentioning

confidence: 99%

“…Irradiance responsivity ratio as a function of the dielectric constant of an uncoated and AR coated immersion lens[3]. The measurements are for a single dipole fabricated onto the flat surface of a germanium immersion lens.…”

mentioning

confidence: 99%

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Evaporation of uniform antireflection coatings on hemispherical lenses to enhance infrared antenna gain

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Section: Figuresupporting

confidence: 62%

Section: Methodsmentioning

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Section: Introductionmentioning

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Section: Introductionmentioning

confidence: 99%

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Evaporation of uniform antireflection coatings on hemispherical lenses to enhance infrared antenna gain

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Folded-Dipole Antenna Geometrical Analysis for THz Microbolometer

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To improve the responsivity of terahertz (THz) antenna-coupled bolometer, heater (load) resistance has to be increased to suppress the thermal conduction and realize larger temperature rise of the thermistor. Proper design of antenna is therefore essential to assure the impedance matching between antenna and heater. From this viewpoint, a high-impedance folded-dipole antenna (FDA) has been studied numerically by the finite element simulation. The effect of FDA structural parameters such as number of arms, antenna width, and arm spacing are discussed with the lumped port and resistive heater coupled to the antenna gap for the cases of radiating and receiving modes, respectively. The product of resonant resistance and area efficiency is used to predict the improvement made by FDA as a figure of merit (FOM) correlated to the bolometer responsivity. This study revealed that the optimum FOM in FDA-coupled bolometer operating at 1 THz was obtained with three arms, 1-μm antenna width and 4-μm arm spacing. A comparison was made with the result from a half-wave dipole antenna and revealed that FDA could enhance the bolometer responsivity by a factor of 15. This research demonstrated the effectiveness of the FDA to improve the performance of THz antenna-coupled bolometer for applications such as imaging for non-destructive inspection.

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Alignment procedure for radiation pattern measurements of antenna-coupled infrared detectors

Krenz

2010

Opt. Eng

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An antenna-coupled detector's directional properties can be verified by measuring its angular radiation pattern. At infrared frequencies, this pattern can be measured by rotating the device while illuminating it with a laser beam. An accurate radiation pattern can be measured only if the device is coaligned with the axis of rotation and the focus of the laser beam. In the alignment procedure presented, the device is rotated to various angles and the distance along the orthogonal axis from the current device position to the laser beam is measured by maximizing its response. Calculations based on these distances provide the new location of the device, which will coalign it with the axis of rotation and the focus of the laser beam. The successful alignment enables accurate radiation pattern measurements.

show abstract

Infrared dipole-coupled bolometer response on a hemispherical silicon immersion lens

Cited by 3 publications

References 3 publications

Evaporation of uniform antireflection coatings on hemispherical lenses to enhance infrared antenna gain

Evaporation of uniform antireflection coatings on hemispherical lenses to enhance infrared antenna gain

Folded-Dipole Antenna Geometrical Analysis for THz Microbolometer

Alignment procedure for radiation pattern measurements of antenna-coupled infrared detectors

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