This study presents an electrically-controlled hybrid plasmon-induced transparency (PIT) metadevice leveraging on nematic liquid crystals for enabling active manipulation of terahertz slow light. Achieving Fano-resonant response via near-field coupling of chiral and achiral meta-atoms facilitates nonlinear terahertz generation and mitigates radiative losses. These findings highlight the potential of Fano-resonant active metasurfaces for advanced sensing and slow-light devices.
We report on the fabrication and characterization of a micro periodic structure realized in soft-composite materials
containing metallic nanoparticles. The particles are used to infiltrate a passive polymer template realized by combining a
holographic curing setup and a microfluidic etching process. In other experiments, small amounts of nanoparticles are
dissolved in the original mixture utilized for the realization of polymer-liquid-crystal-polymer-slices gratings
(POLICRYPS); this enables to fabricate POLICRYPS-like structures showing novel electromagnetic properties.
Obtained structures are characterized in term of impinging probe polarization in the UV/visible range. Correlation
between the optical response and external perturbations (electric field, temperature) is also reported. These first attempts
are oriented to the fabrication of devices with tunable metamaterial properties.
We report on the realization and characterization of a polymeric template sculptured in
photosensitive material, on a chemical inert surface. The structure is devoted to micro/nanoconfinement
and stabilization of a wide range of organic and nano-particle components with selfarrangement
properties at the nanoscale [1]. High quality morphology of a polymeric, micropatterned,
array is obtained by combining a, nano-precision level, optical holographic setup and a
multi-step chemico-physical process. The "universal" template represents the basic platform to be
filled with different organic materials, which can also include metallic nano-particles. The long
range self-organization is induced without making use of any kind of surface chemistry. Due to their
capability of exhibiting self organization, light responsive Liquid Crystals (LC) [2] and short pitch
Cholesterics LC [3] have been exploited, and experimental studies have been carried out in order to
investigate the photo-optical and elecro-optical response of obtained composite structures for the
realization of photonic devices. Finally, the possibility of including metallic nano-particles has been
also investigated, with the aim of inducing a "metamaterial" behavior of the realized structure.
A colour-separating backlight can be made by using a surface-relief grating as an outcoupling structure on top of a lightguide. By combining such a structure with a birefringent layer, a polarised colour-separating backlight can be realised. We discuss experiments and simulations on a prototype of such backlight structures, as well as directions how to optimise them. First optimised samples of gratings made by laser-interference lithography show promising results.
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