Spherical reflector backed structure to enhance dipole antenna coupled IR detector performance

Mubarak, Mohamed H.; Sidek, Othman; Abdel‐Rahman, M.; Shukri, A.

doi:10.1109/apace.2014.7043785

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…1, is composed mainly of a half wavelength dipole as the feeding antenna element, a parabolic reflector and a cavity filling/standoff dielectric layer. A similar antenna structure has been previously simulated and found to have an expected antenna gain increase of 20 dB [14]. A sub‐wavelength bolometer is implemented as a sensing element at the dipole feeding point.…”

Section: Structure Design and Pattern Definitionmentioning

confidence: 99%

“…Considerable efforts have been made to improve the overall efficiency either by increasing antenna coupling efficiency [2,[6][7][8][9][10], sensing device efficiency [10][11][12], and impedance matching efficiency between both the antenna and the sensing device [1,13]. An integrated microparabolic reflector nanoantenna coupled structure was proposed in [14,15] and is expected to contribute with a considerable increase in the detectivity through the reduction in the substrate modes losses, and an added space diversity gain via the new larger optical active area of the device.…”

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confidence: 99%

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Fabrication of microparabolic reflector for infrared antenna coupled detectors

Mubarak

Sidek

Abdel‐Rahman

et al. 2018

Micro & Nano Letters

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The fabrication process of a microparabolic reflector using isotropic xenon difluoride XeF 2 etching technique is presented and analysed through this work for developing infrared antenna-coupled detectors. Although many parametric studies described the behaviour of this process in the literature, the non-linearity of the process and its dramatic dependency on the pattern definition result in great difficulties when adopting the process for developing a particular structure. The main focus of this work is, therefore, to present a detailed etching analysis as dictated in the proposed design providing the proper etching recipe according to the proposed structure design and its associated masking pattern. Deep insights into the process have been highlighted suggesting the necessity of the process assessment in terms of evaluating the threedimensional etched volume rather than the etched depth. This will potentially solve the non-linearity behaviour and the pattern dependency problem. The optimum etching recipe yields approximately a total volume of 0.354 mm 3 through the proper patterning mask. The resultant parabolic cavities have 75 and 13 mm in their diameter and depth, respectively, as required for the proposed structure. The integration of a microparabolic reflector with such detectors will potentially enhance the specific detectivity of these detectors.

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Section: Structure Design and Pattern Definitionmentioning

confidence: 99%

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confidence: 99%

Fabrication of microparabolic reflector for infrared antenna coupled detectors

Mubarak

Sidek

Abdel‐Rahman

et al. 2018

Micro & Nano Letters

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“…In this context, the parabolic reflector integrated structure has been proposed as illustrated in Figure 9 [ 57 ]. Besides reducing the substrate mode losses, that structure also offers high polarization discrimination response and increased effective antenna aperture area that adds a space diversity gain to the detector and inherently increases its detectivity [ 58 ]. A preliminary simulation analysis of a similar structure has shown a 20 dB gain increase compared to the conventional structure [ 59 ].…”

Section: Antenna Designmentioning

confidence: 99%

Nano-Antenna Coupled Infrared Detector Design

Mubarak

Sidek

Abdel‐Rahman

et al. 2018

Sensors

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Since the 1940s, infrared (IR) detection and imaging at wavelengths in the two atmospheric windows of 3 to 5 and 8 to 14 μm has been extensively researched. Through several generations, these detectors have undergone considerable developments and have found use in various applications in different fields including military, space science, medicine and engineering. For the most recently proposed generation, these detectors are required to achieve high-speed detection with spectral and polarization selectivity while operating at room temperature. Antenna coupled IR detectors appear to be the most promising candidate to achieve these requirements and has received substantial attention from research in recent years. This paper sets out to present a review of the antenna coupled IR detector family, to explore the main concepts behind the detectors as well as outline their critical and challenging design considerations. In this context, the design of both elements, the antenna and the sensor, will be presented individually followed by the challenging techniques in the impedance matching between both elements. Some hands-on fabrication techniques will then be explored. Finally, a discussion on the coupled IR detector is presented with the aim of providing some useful insights into promising future work.

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A Wide Dynamic Range Polarization Sensing Long Wave Infrared Detector

Mohammadi

Behdad

2017

Sci Rep

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We present the design, fabrication, and characterization of an infrared (IR) polarization sensing detector with a wide dynamic range and sub-wavelength dimensions. The detector consists of two orthogonal slot antennas, each loaded with two microbolometers at its edges. The polarization of the incoming IR radiation is detected by comparing the received power levels in the bolometer pairs corresponding to each slot antenna. The IR radiation is sensed by applying a dc bias voltage to each antenna and measuring the changes in the dc current caused by the change of the bolometer resistance as they absorb the incoming IR radiation. In this design, the ratio of the absorbed power in the bolometers is a one to one function of the polarization of the incident wave. A prototype of this detector, designed to have maximum sensitivity at λ = 10.6 μm, was designed, fabricated, and characterized. The fabricated detector has an area of 0.7λ × 0.7λ, where λ is the free-space wavelength. The polarization sensing response is characterized under different angles of incidence. The measurement results show that the device has a dynamic range of 24 dB between two orthogonal orientations of EM wave polarization for incidence angles in the range of ±20° from boresight.

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Spherical reflector backed structure to enhance dipole antenna coupled IR detector performance

Cited by 5 publications

References 21 publications

Fabrication of microparabolic reflector for infrared antenna coupled detectors

Fabrication of microparabolic reflector for infrared antenna coupled detectors

Nano-Antenna Coupled Infrared Detector Design

A Wide Dynamic Range Polarization Sensing Long Wave Infrared Detector

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