Tractor beam for fully immersed multiple objects: Long distance pulling, trapping, and rotation with a single optical set‐up. Issue 11 (December 2015)

• Record Type: Journal Article
• Authors: Rahman, Md. Masudur; Sayem, Ayed Al; Mahdy, M. R. C.; Haque, Md. Ehsanul; Islam, Rakibul; Chowdhury, S. Tanvir‐ur‐Rahman; Matin, Md. Abdul
• Is Part Of: Annalen der Physik. Volume 527:Issue 11/12(2015:Nov./Dec.)
• Page Start: 777
• Page End: 793
• Publication Date: 2015-12
• Subjects: Tractor Beam -- Optical Trapping -- Optical Force -- Electromagnetic Beam -- Optical Manipulation; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.201500266
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract : An active tractor beam for multiple fully immersed objects is demonstrated with a single optical setup by using two superimposed higher order Bessel beams of reverse helical nature and different frequencies. This setup would yield stable long distance levitation, a controlled rotation and a desired 3D trapping. Such a conveyor system, based on the optical gradient force, can overcome the radiation pressure and other disturbing forces including viscous drag. Abstract : In this article, we have theoretically demonstrated the mechanism of an active tractor beam for multiple fully immersed objects with additional abilities to yielding stable long distance levitation, a controlled rotation and a desired 3D trapping. This is demonstrated with a single optical set‐up by using two coaxial, or even non‐coaxial, superimposed higher order monochromatic Bessel beams of reverse helical nature and different frequencies . The superimposed beams can possess periodic intensity variations both along and around the beam‐axis due to a difference in longitudinal wave‐numbers and beam orders, respectively. The difference in frequencies of the two laser beams makes the intensity pattern to move along and around the beam‐axis in a continuous way without manual ramping of phase, which allows for bidirectional movement of completely immersed multiple particles. The condition for increasing or decreasing the dimension of binding regions is also proposed here to manipulate multiple immersed objects of different sizes under dipole approximation.