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Technology for fabricating dense sapphire nanostructures using near‑field focusing of ultrafast lasers
Background
Nanostructuring ultrahard materials like sapphire is challenging due to their inherent hardness and chemical stability, which complicate the precise modification and removal of material. Traditional approaches such as multilayer masking, low-power dry etching, and direct ultrafast laser processing have struggled to achieve the fine,...
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Rapid optical metrology of critical dimensions of large-area nanostructure arrays with complex patterns
Background
Scatterometry-based metrology has the capability to perform high-throughput inspection of geometric characteristics of large-area nanopatterned surfaces. It utilizes physics-based dependencies between reflectance of light scattered from nanopatterned surfaces for pre-defined set of wavelengths and Critical Dimensions (CDs) of such nanopatterns.
Current...
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Fabrication of metal-insulator-semiconductor photoelectrodes
Background Photoelectrochemical (PEC) water splitting is a promising technology for converting solar energy into clean and storable chemical energy. In PEC cells, semiconductors play a key role in absorbing photons from the light source to create mobile charge carriers. Various semiconductor materials have been studied for the high-performance PEC cells,...
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Ultra-thin IR detector
BackgroundStrained layer superlattices (SLSs) have attracted significant attention as potential light absorbers for infrared (IR) photodetector applications. Such semiconductor-based structures provide effective band gaps across mid-wave to long-wave IR that are tunable by control of layer thicknesses and material composition. Of particular interest...
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