Waveguide-grating-based optical tweezers for particle trapping

Xin Tong; Lin Zhang

doi:10.1117/12.2656996

27 December 2022 Waveguide-grating-based optical tweezers for particle trapping

Xin Tong, Lin Zhang

Proceedings Volume 12504, International Symposium on Silicon-based Optoelectronics (ISSBO 2022); 1250408 (2022) https://doi.org/10.1117/12.2656996
Event: International Symposium on Silicon-based Optoelectronics (ISSBO 2022), 2022, Hangzou, China

Abstract

On-chip photonic devices are promising for large-scale optical trapping and parallel particle manipulation. Based on a waveguide grating, which can convert light from a localized optical mode to a freely propagating radiation beam, we propose two waveguide-grating-based optical tweezers for trapping micro- and sub-micro-particles. By optimizing the structural parameters of the etched trenches on the waveguide, the intensity distribution of the upward diffraction beam out of the grating is altered to approximate a target beam that can produce large gradient forces. The optimization method generates a focused quasi-Gaussian beam with a waist height of 7 μm above the grating and a beam with quasi-spherical wave wavefronts at ± 20°. The optimized upward radiation beams generate gradient forces up to hundreds of pN/W, which is strong enough for trapping microparticles with a trapping range as high as 20 μm. Besides, the proposed tweezer shows a possibility of trapping sub-micron particles and the potential for large-scale parallel particle manipulation.

Citation Download Citation

Xin Tong and Lin Zhang "Waveguide-grating-based optical tweezers for particle trapping", Proc. SPIE 12504, International Symposium on Silicon-based Optoelectronics (ISSBO 2022), 1250408 (27 December 2022); https://doi.org/10.1117/12.2656996

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available