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We fabricated an electrically tunable metamaterial based on twisted nematics liquid crystal cell, where polarization dependent reflectance of the metamaterial can be controlled via applied voltage. When the metamaterial-twisted nematics liquid crystal cell is driven with a voltage above the threshold, optical reflection of the cell has changed. Our result provides the possibility of tuning the frequency...
Doping level of dopant carrier density of substrates is varied to control the meta-resonances in terahertz metamaterials. Resonance peak position and quality factor exhibit a red shift and broadening when doping level is lowered.
We fabricated 2-dimensional THz metamaterial to manipulate the Fano resonance. We adopted a double-split ring resonator (DSRR) metaparticle possessing polarization-dependent low-Q and high-Q resonances as a basic structure and embedded a rod resonator inside the DSRRs to achieve the polarization control of coupling. We also carried out a FDTD simulation to obtain the absorption spectra of the metamaterial...
Terahertz metamaterial superlattice is fabricated with double-split ring resonators. By cooling down to the cryogenic temperature 4K, changes in Q-factor of closed mode resonance originating from coherent coupling in metamaterial are investigated.
Linear dichroism in metamaterial-twisted nematics structure of nano meta surface is controlled via photoisomerization process. Azo twisted nematic cell structure enables the switching on-off of meta-induced resonance by trans-cis-trans isomerization when irradiated by UV light.
We discuss the electrical resistivity and thermal stability of smooth thin silver (Ag) films characterized by significantly lower root mean square (RMS) surface roughness, peak-to-valley height distribution, and grain-size distribution. The smooth film was prepared by using a very thin (~1-2 nm) nucleation layer of evaporated germanium (Ge) prior to Ag evaporation. The sheet resistance of the rough...
We have also studied the possibility of forming the isotropic 3D negative index material from an assembly of Ag nanoparticles. It appears that various open- and close-packed structures exhibit "soft" electromagnetic response and extraordinary transmission at certain wavelengths that much exceed the period of the structures. It appears that various nanoparticles assemblies are close to having...
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