Multiplying optical tweezers force using a micro-lever
Resource
OPTICS EXPRESS, 19(21), 20604-20609
Journal
Optics Express
Pages
20604
Date Issued
2011
Date
2011
Author(s)
Lin, Chih-Lang
Lee, Yi-Hsiung
Lin, Chin-Te
Liu, Yi-Jui
Hwang, Jiann-Lih
Baldeck, Patrice L.
Abstract
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.
SDGs
Type
journal article
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