Palermo, Giovanna Lininger, Andrew Guglielmelli, Alexa Ricciardi, Loredana Nicoletta, Giuseppe De Luca, Antonio Park, Joon-Suh Lim, Soon Wei Daniel Meretska, Maryna L. Capasso, Federico Strangi, Giuseppe 2024-01-19T11:01:54Z 2024-01-19T11:01:54Z 2022-10-27 2022-10 1936-0851 https://pubs.kist.re.kr/handle/201004/114475 Metasurfaces have been extensively engineered to produce a wide range of optical phenomena, allowing exceptional control over the propagation of light. However, they are generally designed as single-purpose devices without a modifiable postfabrica-tion optical response, which can be a limitation to real-world applications. In this work, we report a nanostructured planar-fused silica metalens permeated with a nematic liquid crystal (NLC) and gold nanoparticle solution. The physical properties of embedded NLCs can be manipulated with the application of external stimuli, enabling reconfigurable optical metasurfaces. We report the all-optical, dynamic control of the metalens optical response resulting from thermoplasmonic-induced changes of the NLC solution associated with the nematic-isotropic phase transition. A continuous and reversible tuning of the metalens focal length is experimentally demonstrated, with a variation of 80 mu m (0.16% of the 5 cm nominal focal length) along the optical axis. This is achieved without direct mechanical or electrical manipulation of the device. The reconfigurable properties are compared with corroborating numerical simulations of the focal length shift and exhibit close correspondence. English American Chemical Society All-Optical Tunability of Metalenses Permeated with Liquid Crystals Article 10.1021/acsnano.2c05887 1 ACS Nano, v.16, no.10, pp.16539 - 16548 ACS Nano 16 10 16539 16548 N scie scopus 000868186300001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article BAND ACHROMATIC METALENS DE-GENNES THEORY PHASE-TRANSITION METASURFACES LENS metalens metasurface reconfigurable thermoplasmonics liquid crystal tunable