Nanowires: A new platform for semiconductor manufacturing with an emphasis in multi-spetral infrared cameras

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This proposal will develop a novel means of wavelength-selective infrared photodetection. Our method, based on ordered arrays of III-V semiconductor nanowires, is expected to yield a high-performance, large-area, low-cost alternative to mercury cadmium telluride mid-wavelength infrared detectors and related detector technologies. These devices are of interest in manufacturing, astronomy, automotive safety, surveillance, search and rescue and defense applications. We have demonstrated in simulations and experiment that nanowires concentrate and absorb light in only a few microns of nanowire length, enabling highly efficient photodetection with relatively little material. This absorption shows wavelength selectivity that can be tuned continuously across the visible and infrared wavelengths by adjusting the nanowire diameter, which we have very tight control over owing to novel growth methods. This behavior leads to a new concept for "multi-spectral" imaging using ordered nanowire arrays compatible with existing silicon technology. This multi-spectral capability is highly desirable for advanced infrared imaging systems with enhanced target discrimination and identification, improved discrimination of absolute temperature and unique signatures of objects, and advanced color processing algorithms for further improved sensitivity. Much of the groundwork for integrating nanowires with standard silicon technology, and perfecting the properties of the nanowires themselves, has already been carried out by us in collaboration with a leading digital imaging company, Teledyne Dalsa. The multi-spectral capability, however, is a new effect only recently discovered by the applicant, and we will pursue its development from fundamental studies to device integration. The development and commercialization of this technology by Teledyne Dalsa will lead to significant economic benefits to Canada due to the wide range of commercial, military, and industrial receptors of sensitive and cost-effective multi-spectral infrared photodetectors and cameras.