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Abstract
Shortwave infrared (SWIR) light is in the wavelength range of 800–2500 nm. It is well-known as noninvasive light because its energy is lower than that of visible and ultraviolet light. In addition, it is characterized by small light loss owing to its low level of absorption and scattering of water and biomolecules in tissue. Therefore, it has a higher bio-transparency than visible and ultraviolet light. In particular, the SWIR region—excluding the areas around 1450 and 1900 nm, where absorption by water is strong—is termed a “biological window” because of its low optical loss.
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