A new approach for engineering the controllable asymmetric coupling in active cavity lattices is experimentally demonstrated. Non-Hermitian skin effect is observed in the proposed Hatano-Nelson phase-locked laser array along with single mode lasing and variable emission distribution. The freedom to design at will the exchange interactions in active lattices enables many possibilities in optics, ranging from a new class of reconfigurable lasers capable of generating steerable emission, to non-Hermitian topological lattices.
A versatile approach for engineering the coupling dynamics in active cavities is proposed and experimentally demonstrated. The freedom to design at will the exchange interactions in active lattices enables many possibilities in optics, ranging from a new class of reconfigurable lasers capable of generating steerable emission, to non-Hermitian topological lattices.
We demonstrate a new platform for reconfigurable third-order nonlinear photonic devices formed by silicon dioxide (SiO2)-Sb2S3(Sb2Se3)-SiO2 subwavelength Fabry-Perot cavities on a gold (Au) reflector, which exhibit giant third-harmonic generation (THG) modulations with enhanced efficiency. The use of the phase-change dichalcogenides (Sb2S3 or Sb2Se3) enables a wide tuning range of the THG response. The devices work at dispersion-engineered THG resonances at the crystalline phase (c-phase) of the PCC, which numerically exhibit c-phase THG flows a few 100 times more than those at the amorphous phase (a-phase) of the PCC at near-infrared excitation wavelengths.
We present a dynamic metasurface platform by incorporating the phase-change alloy Ge2Sb2Te5 (GST) into metal-dielectric meta-atoms for active and non-volatile tuning of the optical response. We systematically design a unit cell, which selectively controls the fundamental plasmonic-photonic resonances of the metasurface via the dynamic change of the GST crystalline state. As a proof-of-concept, we experimentally demonstrate miniaturized tunable metasurfaces that globally manipulate amplitude and phase of incident light necessary for near-perfect absorption and anomalous/specular beam deflection, respectively. Our findings further substantiate reconfigurable hybrid metasurfaces as promising candidates for the development of miniaturized energy harvesting and optical signal processing devices.
This Conference Presentation, "Sample-efficient machine-learning method for designing photonic nanostructures," was recorded at Photonics West 2020 held in San Francisco, California, United States.
This Conference Presentation, "Deep-learning-based design of Fano resonant HfO2 metasurfaces for full color generation," was recorded at Photonics West 2020 held in San Francisco, California, United States.
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