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Oxygen is necessary for the nutrition of living cells in a human body, and a low oxygen supply can damage the human tissues and cause hypoxia and loss of consciousness. Moreover, oxygen deficiency in the brain can directly damage the nervous system, resulting in memory loss and unconsciousness if the deficiency persists. Therefore, the determination of oxygen saturation (SpO2) in the human body in...
This paper presents wafer-level aperiodic nanostructures fabrication of sapphire substrates with broadband optical transmittance. The nanostructures were patterned by using nickel silicide as a hard mask, and performed by inductively coupled plasma reactive ion etching. The sapphire substrates with nanostructures exhibit high transmittance at wide incident angles over broadband spectra compared with...
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