We have developed a miniaturized silicon photonics short-wave infrared spectrophotometer that fits in a wrist-based wearable device. Our device has the capability for non-invasive and real-time measurement of various physiologic biochemistries that cannot be interrogated with the same accuracy when using light emitting diodes (LEDs) and common photoplethysmography (PPG) applications. By producing many discrete and individually addressable laser diodes on a single photonics integrated circuit together with wavelength multiplexing and on-chip wavelength and power monitoring, our platform enables novel commercial applications, including the ability to sense hydration status, core body temperature, alcohol consumption, lactate threshold, and glucose levels.
The development of an ultra-compact, short-wave infrared spectrophotometer small enough to fit in a wrist-based wearable device produces the capability for non-invasive and real-time measurement of various physiologic biochemistries that cannot be interrogated with the same accuracy when using light emitting diodes (LEDs) and common photoplethysmography (PPG) applications. By producing many discrete and individually-generated light sources from tens of laser diodes on a single, silicon-based photonics integrated circuit (PIC), this new platform enables us to determine a user’s body temperature, hydration status, and concentrations of solutes within the dermal interstitial fluid, potentially useful in monitoring health in a novel way.
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