Multiplying optical tweezers force using a microlever

Chih Lang Lin, Yi Hsiung Lee, Chin Te Lin, Yi Jui Liu, Jiann Lih Hwang, Tien Tung Chung, Patrice L. Baldeck

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This study presents a photo-driven micro-lever fabricated to multiply optical forces using the two-photon polymerization 3D-microfabrication technique. The micro-lever is a second class lever comprising an optical trapping sphere, a beam, and a pivot. A micro-spring is placed between the short and long arms to characterize the induced force. This design enables precise manipulation of the micro-lever by optical tweezers at the micron scale. Under optical dragging, the sphere placed on the lever beam moves, resulting in torque that induces related force on the spring. The optical force applied at the sphere is approximately 100 to 300 pN, with a laser power of 100 to 300 mW. In this study, the optical tweezers drives the micro-lever successfully. The relationship between the optical force and the spring constant can be determined by using the principle of leverage. The arm ratio design developed in this study multiplies the applied optical force by 9. The experimental results are in good agreement with the simulation of spring property.

Original languageEnglish
Pages (from-to)20604-20609
Number of pages6
JournalOptics Express
Issue number21
StatePublished - 10 Oct 2011


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