Frequency selective infrared optical filters for micro-bolometers
| Autor: | Mark S. Mirotznik, Lenin Zaman, Ahmed Sharkawy, Mathew J. Zablocki, Dennis W. Prather, Timothy Creazzo |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry 0206 medical engineering Bolometer Detector Metamaterial Hyperspectral imaging Microbolometer 02 engineering and technology 020601 biomedical engineering law.invention 03 medical and health sciences 0302 clinical medicine Optics Narrowband law Optoelectronics business Optical filter 030217 neurology & neurosurgery Infrared cut-off filter |
| Zdroj: | Micro- and Nanotechnology Sensors, Systems, and Applications IX. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2262874 |
| Popis: | Current micro-bolometers are broadband detectors and tend to absorb a broad window of the IR spectrum for thermal imaging. Such systems are limited due to their lack of sensitivity to blackbody radiation, as well as the inability to spectrally discern multiple wavelengths in the field of view for hyperspectral imaging (HSI). As a result, many important applications such as low concentration chemical detection cannot be performed. One solution to this problem is to employ a system with thermoelectrically cooled or liquid nitrogen cooled sensors, which can lead to higher sensitivity in detection. However, one major drawback of these systems is the size, weight and power (SWaP) issue as they tend to be rather bulky and cumbersome, which largely challenges their use in unmanned aerial vehicles. Further, spectral filtering is commonly performed with large hardware and moving gratings, greatly increasing the SWaP of the system. To this point, Lumilant’s effort is to develop wavelength selective uncooled IR filters that can be integrated onto a microbolometer, to exceed the sensitivity imposed by the blackbody radiation limit. We have demonstrated narrowband absorbers and electrically tunable filters addressing the need for low-SWaP platforms. |
| Databáze: | OpenAIRE |
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