レーザ光ピンセット

レーザ ヒカリ ピンセット

Laser Optical Tweezers

葛谷, 幹夫||クズヤ, ミキオ||Kuzuya, Mikio

中部大学工学部

中部大学工学部紀要 <XB15000033> 51巻 (2016.3)

21877408

09108629

中部大学工学部紀要

51

42-52

2016.03

Optical tweezers, Diode laser, Long working distance lens, Trapping force, Rotation torque

This paper describes a laser optical tweezers (LOT) system, which was constructed by combining a diode laser with an optical microscope equipped with a long working distance objective lens. The system incorporates motor-driven beam steering optics which allows for positioning the trapping spot with micrometer resolution. The LOT system was applied to the manipulation of several particles, such as a polystyrene particle, a ceramic particle, a yeast cell. etc. The optical trapping forces and the optical rotation torque of the system were determined by the viscous drag forces and torque calculated using Stokes' law. The experimental results showed that trapping forces linearly increased with the laser power, and the forces generated were of the order of piconewtons (pN) when the laser power was about 10 mW. The rotation torque also linearly increased with the laser power and the observed increase in torque with power was approximately 10-19 Nm per mW. The values of the trapping forces and torque were compared to the momentum and angular momentum of the laser beam. It was shown that the LOT system developed here can be used in the manipulation of red blood cells and the rotation of a micro gear of 1μg in weight.

半導体レーザと長作動距離対物レンズの組み合わせからなる光ピンセットを開発し,その基礎特性を調べた.開発した光ピンセットは各種微粒子の捕捉,移動,回転ができることを確認した.トラップ力および回転トルクはレーザパワーに比例して増加し,レーザ出力10mWでトラップ力はpN,回転トルクはpN・mmオーダとなる.フォトンの運動量および角運動量と比較した結果,トラップ力はレーザの放射圧の約2.3%,回転トルクは円偏光レーザの全トルクの約25%に相当することがわかった.

2016.03.28

紀要論文

Departmental Bulletin Paper

PDFファイル

publisher

中部大学