Dynamic adjustable optical tweezers based on polarization-sensitive transverse bifocal superlens

By using a polarization-sensitive transverse dual-focal superlens for composite phase modulation, multifunctional particle manipulation of optical tweezers was achieved, overcoming the limitations of traditional optical tweezers in multifocal dynamic manipulation and flexible particle capture mode switching, and improving the system's integration and response speed.

CN121679768APending Publication Date: 2026-03-17BEIJING UNIV OF POSTS & TELECOMM
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Patent Information

Application Number
CN202511806205.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-03
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing optical tweezers technology has limitations in achieving multi-focus dynamic manipulation and flexible particle capture mode switching, and its functions are limited and lack integration and flexibility.

Method used

Optical tweezers based on polarization-sensitive transverse double-focal superlenses are used to achieve flexible switching and dynamic control of particle capture modes by utilizing the change in polarization state of incident light through composite phase modulation technology. These modes include dual-particle capture, single-particle capture, capture force modulation, and lateral particle transport.

Benefits of technology

It achieves high integration, fast response and multi-functional control of optical tweezers, and can flexibly switch between multiple particle manipulation modes by adjusting the polarization state of incident light without changing the physical structure, thus improving the system's flexibility and tunability.

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Abstract

The invention relates to dynamic adjustable optical tweezers based on a polarization-sensitive transverse bifocal superlens, and belongs to the field of optical tweezers technology and micro-nano optics. According to the super-lens, dynamic regulation and control of a focus are realized by using sensitive response of the silicon nano-column array to polarization through a composite propagation phase and a geometric phase. Under linear polarization or elliptically polarized light, the system can generate transversely symmetrical double focuses; under the circularly polarized light, a single-side focus is formed. By adjusting the polarization state of incident light, a double-particle capture mode, a single-particle capture mode and a particle transverse transport mode can be flexibly switched. According to the invention, the physical structure does not need to be changed, the dynamic control can be realized only by external optical regulation and control, the structure is compact, the integration degree is high, the control is flexible and the like, and a new technical approach is provided for an on-chip particle control system.
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