Next Article in Journal
Numerical Investigation of Thermal Buoyancy, the Electromagnetic Force and Forced Convection in Conventional RF Systems for 4-Inch Sic by TSSG
Previous Article in Journal
Synthesis of MgFe Layered Double Hydroxide from Iron-Containing Acidic Residual Solution and Its Adsorption Performance
Previous Article in Special Issue
Chiral Optical Tamm States at the Interface between an All-Dielectric Polarization-Preserving Anisotropic Mirror and a Cholesteric Liquid Crystal
Open AccessArticle

Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors

1
Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
2
Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
3
Department of Physics, Paderborn University, D-33098 Paderborn, Germany
4
Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(10), 515; https://doi.org/10.3390/cryst9100515
Received: 8 September 2019 / Revised: 30 September 2019 / Accepted: 2 October 2019 / Published: 7 October 2019
(This article belongs to the Special Issue Localized Optical Modes in Liquid Crystals)
Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications. View Full-Text
Keywords: metalens; metamaterials; Pancharatnam-Berry phase; optical tweezers; optical trap; liquid crystal droplets metalens; metamaterials; Pancharatnam-Berry phase; optical tweezers; optical trap; liquid crystal droplets
Show Figures

Figure 1

MDPI and ACS Style

Suwannasopon, S.; Meyer, F.; Schlickriede, C.; Chaisakul, P.; T-Thienprasert, J.; Limtrakul, J.; Zentgraf, T.; Chattham, N. Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. Crystals 2019, 9, 515.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop