Tunable and reconfigurable metadevices  (Conference Presentation)

Jinghua Teng

doi:10.1117/12.2322608

17 September 2018 Tunable and reconfigurable metadevices (Conference Presentation)

Jinghua Teng

Author Affiliations +

Proceedings Volume 10719, Metamaterials, Metadevices, and Metasystems 2018; 107190H (2018) https://doi.org/10.1117/12.2322608
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Tunable and reconfigurable metadevices constructed by metamaterials and metasurfaces will bring optics and photonics the highly desired on-demand property control. In this talk, I will introduce our recent work on three types of tunable and reconfigurable metadevices based on different principles for different applications. We demonstrated a continuous orbital angular momentum (OAM) transmitter comprising bilaterally symmetric gratings with an aperture to create arbitrary rational-order optical vortex beams without a theoretical limit. The vortex beam has a distinguished spiniform wavefront with phase singularities located equidistant along a line and tunes its average OAM by changing the number of singularities the beam accommodates. The approach realizes both non-integer and arbitrary rational-order generation of OAM and enables the exploration of quantum entanglement using such continuous OAMs. Phase change material GST is known for its huge optical property difference between amorphous and crystalline states. We used fs laser pulse trains to create high resolution multi-level phase changes in GST films and demonstrated reconfigurable optical devices like lens in various types, iteratively modifiable grayscale photomasks and waveguides for bidirectional transport of nanoparticles. Si based photonics with CMOS compatibility is of great interest for the potential integrations with electronics and the benefits from the scalable Si process. We used a CMOS compatible process to create an electrically and thermally tunable Si metasurface for broadband terahertz antireflection application. Perfect antireflection condition can be precisely achieved. The methodology suggests a possibility of using all-silicon platform for making atomically smooth and tunable metadevices in THz and other frequency range.

Conference Presentation

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Jinghua Teng "Tunable and reconfigurable metadevices (Conference Presentation)", Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107190H (17 September 2018); https://doi.org/10.1117/12.2322608

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KEYWORDS

Silicon

Spiral phase plates

Antireflective coatings

Photonics

Crystals

Metamaterials

Optical properties

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