Abstract
Electro-optic switching of reflection and refraction is experimentally demonstrated in metasurface liquid crystal cell. Negative metasurface is fabricated by focused-ion-beam milling, and twisted nematic cells are constructed with complementary double-split ring resonator and V-shape slot antenna metasurface. By application of an external voltage, electro-optic switchings are achieved in reflection and refraction. It has a strong implication for applications in spatial light modulation and wavelength division multiplexer/demultiplexer in a near-IR spectral range.
Highlights
Metamaterial is artificially structured material with subwavelength-sized inclusions, which exhibits responses not readily observed in natural material
When an electro-optic control of optical properties is studied in metasurface liquid crystal (MSLC) cell, negative metasurface fabricated by focused ion beam (FIB) milling has an advantage over positive metasurface, since a large metallic area of a negative metasurface can be employed as electric contact needed for electro-optic control in MSLC cell
3 Conclusions In summary, we experimentally demonstrated an electrooptic switching in metasurface liquid crystal cell
Summary
Metamaterial is artificially structured material with subwavelength-sized inclusions, which exhibits responses not readily observed in natural material. While 3D metamaterial is rather difficult to fabricate, 2D metamaterial can be fabricated on a substrate by well-established processes of photo-lithography, electron beam lithography (EBL), and focused ion beam (FIB) milling. In this work we introduce two examples of electrooptic control of near-IR optical response in MSLC cell. The first example makes use of reflection resonances in metasurface with inclusion of split-ring resonators, and the alignment of twisted nematics in MSLC cell is controlled electro-optically permitting a functionality of tunable reflection. After a discussion on Babinet principle to compare scattering fields from dipole and slot antennas constituting metasurface, a fabrication of metasurface and construction of MSLC cell are introduced. The near-IR optical characteristics is presented, and the electro-optic controls are demonstrated
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