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Vol. 235, Issue 7, July 2019, pp. 1-8




Theoretical Consideration on Potential and Scalability of Optical Rotors
based on a pn-Junction Rod

Yasuhisa OMURA

Kansai University, 3-3-35 Yamate-cho, Suita, 564-8680, Japan ACA & C, Okazaki, Isehara, 259-1135, Japan
Tel.: +81-6-6368-1121, fax: +81-6-6368-8843

E-mail: omuray@kansai-u.ac.jp


Received: 15 April 2019 /Accepted: 28 May 2019 /Published: 31 July 2019

Digital Sensors and Sensor Sysstems


Abstract: This paper theoretically investigates how a Si pn-junction rod offers the potential to develop rotating motion. An analytical steady state solution of excess carrier concentration of the Si rod is derived from the continuity equation. The solution is given by a non-linear differential equation. Numerical calculation results strongly suggested that a 200 m-long Si rod should rotate with the acceleration of ~103 m/s2 under the illumination of 1 W/cm2. This is very good performance. It is also shown that this performance holds even for nano-scale rod rotors. It is expected that such rotors will suit various medical test chips that have no battery.


Keywords: pn junction, Rod, Light illumination, Rotation, Carrier generation, Recombination, Power generation.


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