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Terahertz waves bound inside a metallic rod-array is successfully demonstrated and used to sense ultra-thin molecular layers in the presentation. From the transmitted surface waves with constructive interference, nanometer-thick films of SiO2 and ZnO are successfully identified, corresponding to λ/1923 and superior to the available THz sensors.
We study the scattering, absorption and extinction of THz radiation by 2D plasmonic crystals formed by periodic arrays of semiconductor particles. The particles sustain localized surface plasmon resonances that can couple to diffracted orders of the array giving rise to hybrid plasmonic-photonic modes. These modes exhibit extraordinary extinction and narrow line widths. The coupling strength and,...
The dependence of the transmission spectra for the array composed of the planar split-ring and circular-ring on meta-atom orientation has been studied experimentally and by simulation in the terahertz region. We observe the systematic change of the spectra with the meta-atom orientation and interpreted it by the interaction among the meta-atoms in the periodic array structure.
We demonstrate that various features of a complex GaAs/AlGaAs heterostructure superlattice can be resolved using coherent acoustic phonon spectroscopy (CAP) and that CAP is a viable non-destructive metrological tool in the study of stratified media.
We present unique phenomena of enhanced transmission of terahertz (THz) waves through a self-organized eutectic metamaterial1. Our experimental results in combination with theoretical calculations show that the experimentally observed enhanced transmission is associated with sub-wavelength waveguiding within the dielectric rods lattice embedded in an epsilon-near zero polaritonic host.
The design and simulation of a dielectric lens for beam deflection in the terahertz range is presented. The device consists of a lattice of sub-wavelength holes in a rectangular dielectric slab, and by varying the radii of the holes with respect to position, a gradient index (GRIN) lens can be realised. Beam deflection is achieved by giving the refractive index a ramp-like characteristic. The lens...
We explore the degree to which infrared thermal emission can be tailored using an array of dielectric spheres coated with a negative permittivity material. The spheres themselves have absorption peaks in the IR. The emission spectrum is then modified using the arrangement of the spheres.
We developed vertical emitting THz QCL sources having an optical resonator based on a quasi-periodic patterning of the top metal layer of a double-metal waveguide. The designed pattern induces a distributed feedback effect capable of providing optical feedback as well as vertical extraction in a sharply collimated far field.
Cavities based on a periodic-surface-lattice (PSL) of cylindrical topology have been studied. The lattice perturbations have an amplitude much smaller than the operating wavelength of the structure, allowing the PSL to be described as an effective metadielectric or high impedance surface. Dispersive plots describing the electromagnetic (EM) properties of the PSL are presented and the potential for...
Multi-extreme THz ESR measurements have been performed on Cr-jarosite, which is an ideal model substance of highly frustrated kagome antiferromagnet. The analysis of antiferromagnetic resonances observed at 1.9K revealed the Dzyaloshinsky-Moriya interaction, which plays an important role on the ground state.
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