Optical properties of metasurfaces infiltrated with liquid crystals

Authors
Lininger, AndrewZhu, Alexander Y.Park, Joon-SuhPalermo, GiovannaChatterjee, SharmisthaBoyd, JonathanCapasso, FedericoStrangi, Giuseppe
Issue Date
2020-08-25
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.117, no.34, pp.20390 - 20396
Abstract
Optical metasurfaces allow the ability to precisely manipulate the wavefront of light, creating many interesting and exotic optical phenomena. However, they generally lack dynamic control over their optical properties and are limited to passive optical elements. In this work, we report the nontrivial infiltration of nanostructured metalenses with three respective nematic liquid crystals of different refractive index and birefringence. The optical properties of the metalens are evaluated after liquid-crystal infiltration to quantify its effect on the intended optical design. We observe a significant modification of the metalens focus after infiltration for each liquid crystal. These optical changes result from modification of local refractive index surrounding the metalens structure after infiltration. We report qualitative agreement of the optical experiments with finite-difference time-domain solver (FDTD) simulation results. By harnessing the tunability inherent in the orientation dependent refractive index of the infiltrated liquid crystal, the metalens system considered here has the potential to enable dynamic reconfigurability in metasurfaces.
Keywords
FLAT OPTICS; PHASE; WATER; RESOLUTION; FLAT OPTICS; PHASE; WATER; RESOLUTION; optical metasurfaces; liquid crystal; reconfigurable metasurface
ISSN
0027-8424
URI
https://pubs.kist.re.kr/handle/201004/118242
DOI
10.1073/pnas.2006336117
Appears in Collections:
KIST Article > 2020
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