We present a dynamic metasurface driven by polarization-twisting beams to demonstrate the rotational Doppler effect. Polarization-twisting pulses, composed of left and right circularly polarized pulses with shifted center frequencies, generate a rapidly rotating linearly polarized field. We employed nanocylinders made of amorphous silicon as the building blocks of the metasurface. The rotating field alters the permittivity of the nanocylinders due to the nonlinear Kerr effect, thereby enabling the metasurface to function effectively as a fast-rotating waveplate. When a probe beam passes through this metasurface, both its frequency and spin state are altered due to the rotational Doppler effect. This phenomenon could be potentially used for developing magnetic field-free optical isolators.
dWe demonstrate a nonlinear chiral meta-mirror consisting of an array of amorphous silicon split-ring resonators on top of a silver backplane with a silica spacer layer. This hybrid dielectric-plasmonic system can enhance Mie-resonance to result in strong light-matter interaction on the nanometer scale. The chiral meta-mirror exhibits a sharp absorption on one handedness of the circular polarization, and reflects the opposite handedness in a manner that preserves its polarization state in the linear regime. We show that the chiroptical responses can be tuned dynamically by leveraging photoexcited carriers in amorphous silicon. All optical, picosecond scale intensity modulation and polarization switching are studied.
In this paper, we experimentally demonstrated a new technique of electric-field assisted assembly of core-shell particles to create uniform contact hole array with complex geometries. A spatially varying dielectrophoretic (DEP) force created by lithographically defined guiding features is used to control the particle position. The influence of the predefined guiding features on contact hole pattern displacement is systematically studied. The results show that the center-to-center spacing rather than the size and shape of the guiding features determines the particle placement, which indicates the self-healing potential of this technique.
In this paper, we investigate an electric-field assisted assembly approach to create dense arrays of contact hole patterns with complex feature geometries. This hybrid strategy uses a spatially varying dielectrophoretic (DEP) force created by lithographically defined guiding features to assemble dense arrays of nanoparticles within the features, thereby replicating features within the starting pattern. For close-packed particle arrays, the half- and full-pitch of the contact hole array is defined by the starting nanoparticle core and shell diameter.
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