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Metamaterials and metasurfaces
08:30 Invited talk: Subwavelength waveguide arrays for spatial phase manipulation of microwaves
Dominic Palm, Marco Rahm
Technische Universität Kaiserslautern (Germany)
We design, fabricate and experimentally test waveguide arrays with subwavelength width and periodicity to manipulate the spatial phase of microwaves. The electromagnetic performance of the waveguide arrays is optimized by use of a particle swarm algorithm.
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08:50 Invited talk: Meta-waveguides: a marriage between metasurface and integrated photonics enabling subwavelength control of guided waves
Xingjie Ni
The Pennsylvania State University (USA)
Metasurfaces with unparalleled light controllability have shown great potential to revolutionize conventional optics. However, they mainly require free-space light excitation, making it challenging to integrate them on-chip fully. Here, we present metasurface-incorporated waveguides that synergize subwavelength metaphotonic architectures with photonic integrated waveguide platforms. Such meta-waveguides achieve various functions in a completely integrated platform, such as steering and focusing guided waves into free space, projecting holograms with controlled phase and amplitude control, and generating laser emission carrying orbital angular momenta. Our study shows a viable route toward complete control of light across integrated photonics and free-space platforms and paves the way for creating multifunctional photonic integrated devices with agile access to free space.
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09:10 Invited talk: Simultaneously photonic and phononic metamaterials
online, live
Oliver B. Wright (1), Motonobu Tomoda (1), Osamu Matsuda (1), Ting Zhang (2), Tetsuya Ueda (3)
(1)Hokkaido University (Japan) , (2)Nanjing University of Information Science and Technology (China) , (3)Kyoto Institute of Technology (Japan)
Metamaterials have been primarily studied in electromagnetics and acoustics to date. In the fields of photonic and phononic crystals, structures simultaneously exhibiting both optical and acoustic---so-called phoXonic\textemdash properties---have been proposed, but this has not been done for metamaterials. Here we propose the concept of a phoxonic metamaterial, and demonstrate a working design in the GHz electromagnetic and kHz acoustic range that can simultaneously exhibit negative electromagnetic refraction at the same time as negative acoustic refraction.
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online, on-demand
Teun-Teun Kim, Soojeong Beak, Hosub Lim, Sang Hyun Park, Bumki Min
University of Ulsan (Korea)
Since the sensitivity around EPs is significantly enhanced, Non-Hermitian photonics has become an emerging research area that has been extensively studied in different spectral regions using various optical systems. Here, we demonstrate sensing of amyloid-beta (A?) protein, a well-known precursor for Alzheimer's disease by an abrupt phase transition near an exceptional point in non-Hermitian¬ metasurfaces.
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online, on-demand
Yoshiaki Nishijima, Naoki To
Yokohama National University (Japan)
Here we summarized the recent progress of plasmonic meta surfaces in mid infrared wavelength region. The experimentally measured optical properties were com- pared with simulations by Finite difference time-domain calculations. Also, we demonstrate applications of these structures for the plasmonic IR-light sources and detec- tors.and another sensing devices.
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10:10 Invited talk: Generation of tunable order Bessel beams with cascaded metasurfaces
online, on-demand
Yan Zhang (1), Guocui Wang (1), Bin Hu (2), Xinke Wang (1)
(1)Capital Normal University (China) , (2)Beijing Institute of Technology (China)
A variorder Bessel beam generator is experimentally demonstrated with two metasurface devices. Two cascading metasurfaces are employed to generate Bessel beams in the terahertz range. The order of generated Bessel beam can be turned by rotating the metasurface. The order of the Bessel beam is changed from zero-order to fourth-order when the rotation angle of metasuface components from 20 degrees to 80 degrees.
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