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We proposed a novel planar meta-atom structure supporting higher order Fano resonances. The unit cell consists of a plasmonic defective corrugated metallic disk (CMD). The numerical and experimental results reveal that higher order Fano resonances can be generated at terahertz frequencies when symmetric CMD is broken with small defective angle. Such higher order Fano resonances result from the coupling...
We have measured the transmission spectra of splitring resonator metamaterials from 0 to 10 THz for parallel and perpendicular polarizations. Calculations of the lattice and plasmon mode dispersion relations in combination with electromagnetic simulations confirm the presence of multiple higher order lattice and plasmon modes. High frequency high-Q resonances that result from plasmon-lattice mode...
We discuss the possibilities of microring resonator based frequency comb sources for applications to THz-wave generation. Numerical simulations were performed using the Lugiato-Lefever model, combined with fully vectorial modal analyses, to investigate how the cavity design impacts the coherence properties of the combs and to quantitatively estimate the power conversion efficiency from the pump to...
A subwavelength-in-thickness three-layer (gold micro-disk/quantum well infrared photodetector (QWIP)/metal reflector, MIM) plasmonic micro-cavity structure has been developed as a coupling resonator to enhance the photo-responsivity of the QWIP. The disk cavity structure captures and confines the incident light at the resonant wavelengths due to the near-field plasmonic effect. Comparing with the...
Free-electron lasers have specific time form of its radiation (usually continuous train of very shot pulses) and specific instabilities of the radiation. The fast instabilities change intra-pulse coherency of the radiation and produce large-scale side-band frequency modes. The slow instabilities change coherency between pulses and have an influence on fine structure of the spectra, which consist of...
In this work, we present the design of a LEKID aluminum pixel that potentially can be used as part of a detector array on a millimeter wavelength system detection to be installed on a millimeter wavelength telescope. The LEKID pixel is designed to work at 250 mK bath temperature, simulations of the optical coupling show that detector absorb EM radiation within of the 2-mm wavelength atmospheric window...
Terahertz light-matter interactions within a semiconductor-filled waveguide can be tuned in space and time via photoexcited regions created on ultrafast time scales and sub-THz wavelength length scales by a patterned optical pulse. These light-induced metal-dielectric structures can be used to dynamically modify the photonic band structure of THz light within the waveguide, controlling the amplitude,...
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