Mr. Pavana Siddhartha Kollipara Profile

Pavana Siddhartha Kollipara

SPIE Involvement:

Author

Area of Expertise:

Optical Manipulation , Thermophoresis , Microrotors , Nanorotors , Lithography

Publications (5)

Proceedings Article | 5 October 2023 Presentation

Optical manipulation of light-absorbing particles in a surfactant-based solid media

Pavana Siddhartha Kollipara, Zhihan Chen, Yuebing Zheng

Proceedings Volume PC12649, PC1264915 (2023) https://doi.org/10.1117/12.2680851

KEYWORDS: Particles, Optical manipulation, Solids, Matrices, Information security, Thermography, Switching, Photonic devices, Optical tweezers, Nanotechnology

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SPIE Journal Paper | 16 June 2023 Open Access

Breaking boundaries in optical manipulation: beyond Nobel-Prize-winning tweezers

Pavana Siddhartha Kollipara, Yuebing Zheng

PI, Vol. 2, Issue 02, C04, (June 2023) https://doi.org/10.1117/12.10.3788/PI.2023.C04

KEYWORDS: Optical manipulation, Optical tweezers, Physics, Particles, Adhesives, Solids, Materials science, Engineering, Waveguides, Pulsed laser operation

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Proceedings Article | 1 August 2021 Presentation + Paper

Symmetric and isotropic micro/nanorotors driven by a plane-polarized gaussian laser beam

Hongru Ding, Pavana Siddhartha Kollipara, Abhay Kotnala, Zhihan Chen, Yuebing Zheng

Proceedings Volume 11798, 117981U (2021) https://doi.org/10.1117/12.2593464

KEYWORDS: Particles, Picosecond phenomena, Ions, Thermoelectric materials, Sodium, Chlorine, Polymers, Polarization, Optical manipulation, Microfluidics

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Proceedings Article | 20 August 2020 Presentation

Opto-thermoelectric speckle tweezers for large-scale trapping and filtration of particles

Abhay Kotnala, Pavana Siddhartha Kollipara, Yuebing Zheng

Proceedings Volume 11463, 114631B (2020) https://doi.org/10.1117/12.2567825

KEYWORDS: Particles, Speckle, Nanoparticles, Microfluidics, Nanolithography, Printing, Optical tweezers, Plasmonics, Laser development, Biomedical optics

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Proceedings Article | 20 August 2020 Poster + Paper

Understanding and optimizing laser-induced thermoelectric forces for enhanced trapping and manipulation of colloidal particles

Pavana Siddhartha Kollipara, Linhan Lin, Yuebing Zheng

Proceedings Volume 11463, 1146325 (2020) https://doi.org/10.1117/12.2567506

KEYWORDS: Optical tweezers, Nanoparticles

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Several studies have been proposed to control particle trajectory in liquid solutions using optically induced thermal gradient. Upon introducing different solutes such as salts and surfactants along with microparticles in these solutions, an additional optically induced thermoelectric trapping force is generated due to the differential motion of ions in the solution under thermal field. As the complexity of the solution increases, it becomes increasing difficult to understand particle response towards laser irradiance. More importantly, the existing models to study the thermoelectric behavior of the particle assumes a constant temperature gradient across the particles, which becomes obsolete in the micro-regime due to discontinuity of thermal conductivity at the particle-solution interface. For a better understanding of trapping and manipulation behavior of particles under light induced thermoelectric field, the temperature gradient distortion must be considered. In this work, full-scale finiteelement solver model has been proposed to determine the temperature variation around a microparticle under laser heating. The resultant temperature distribution is utilized to numerically evaluate the thermoelectric field and the trapping potential of the laser induced opto-thermoelectric trap. To experimentally validate this methodology, polystyrene micro-particles are trapped opto-thermoelectric-ally in CTAC solution and compared the experimental trapping stiffness to theoretical estimates obtained from the model. It is observed that trapping stiffness saturates as surfactant concentration increases which can be optimized by choosing the lowest CTAC concentration at the onset of saturation. The model implemented here can be easily extended to arbitrarily shaped particles, particles with non-uniform surface morphology, different combinations of core-shell particles and electrolyte solutions, which can be implemented to study different phenomenon such as optical pulling, rotation and translation.

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