We present a laser-actuated adaptive optical diaphragm that is capable of aligning the disturbance of the coaxiality of the optical signal and the plane of aperture. The diaphragm consists of two layers of immiscible liquids, where the bottom layer absorbs a pumping laser beam and transmits an optical signal, while the upper layer transmits the pumping laser beam and stops the optical signal. The operating principle is based on creating the circular thermocapillary rupture of the upper layer by Marangoni forces induced by heating with the pumping laser beam. The thermocapillary rupture serves as an aperture of the diaphragm. The aperture diameter at a fixed power of the laser beam depends on the upper layer thickness and reaches diameters up to two times larger in comparison with diaphragms operating on electrowetting and dielectrophoresis. The aperture tuning ratio is 100%. By shifting the pumping laser beam in the plane of the diaphragm, the aperture can be displaced for a distance up to a few of its radii.
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7 January 2019
Research Article|
January 09 2019
Laser-actuated optofluidic diaphragm capable of optical signal tracking
D. S. Klyuev;
D. S. Klyuev
Photonics and Microfluidics Lab, Tyumen State University
, Volodarskogo 6, Tyumen 625003, Russia
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V. M. Fliagin;
V. M. Fliagin
Photonics and Microfluidics Lab, Tyumen State University
, Volodarskogo 6, Tyumen 625003, Russia
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M. Al-Muzaiqer;
M. Al-Muzaiqer
Photonics and Microfluidics Lab, Tyumen State University
, Volodarskogo 6, Tyumen 625003, Russia
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N. A. Ivanova
N. A. Ivanova
a)
Photonics and Microfluidics Lab, Tyumen State University
, Volodarskogo 6, Tyumen 625003, Russia
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 114, 011602 (2019)
Article history
Received:
October 03 2018
Accepted:
December 20 2018
Citation
D. S. Klyuev, V. M. Fliagin, M. Al-Muzaiqer, N. A. Ivanova; Laser-actuated optofluidic diaphragm capable of optical signal tracking. Appl. Phys. Lett. 7 January 2019; 114 (1): 011602. https://doi.org/10.1063/1.5063961
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