Interferometer based on total internal reflection

Sainov, S.; Sainov, V.; Stoilov, Georgi

doi:10.1364/ao.34.002848

Cited by 4 publications

(1 citation statement)

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“…Since the discovery of TIR of light in 1800's by John Tyndall [8], the TIR principle has been employed in several applications including a fiber-optic communication system, an optical switch [9][10], an optical beam deflector [11], a fiber-optic hydrophone [12], an interferometer [13][14], a fiber-optic sensor [15], the measurement of refractive index [16][17], spectroscopy [18], a fingerprint input device [19][20], and microscopy [21]. Recently, a user friendly TIR-based optical touch switch was also proposed and successfully demonstrated [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Light-scattering-based high contrast optical touch sensor architectures in transmissive and reflective configurations

Sumriddetchkajorn

Amarit

2005

SPIE Proceedings

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Transmissive and reflective optical touch switch architectures based on the use of light scattering are proposed. Key features include high ON/OFF switching ratio, tunable sensitivity, ease of implementation, and no leakage optical beam incident on the user. Experimental proof of concept using a visible laser diode and a plastic Dove prism arranged in the transmissive configuration shows a high 24.4 dB contrast ratio which is a hundred times higher than obtained in the previous total internal reflection-based optical touch switch. In addition, switching response in milliseconds is also investigated for both lifting and sliding the fingertip out of the touching surface of the optical touch switch. Our light scattering-based optical touch switch also supports multiple keystroke operation.

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