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Tunable Infrared Metasurface based on VO2 for Anti-Counterfeiting and Adaptive Radiative Cooling
No full textWe demonstrate tunable infrared metasurface by utilizing metal-insulator transition material of VO2. Switching optical property between dielectric and negative dielectric opens new functionality of metasurface such as anti-counterfeiting and adaptive radiative cooling in wide range of spectra from near- to mid-IR range
Analytical and numerical study of T-shaped plasmonic demultiplexer based on Fano and induced transparency resonances
No full textWe give both analytically and numerically a demonstration of the possibility to realize a simple plasmonic demultiplexer based on Fano and electromagnetic induced transparency resonances. The demultiplexer consists in a waveguide with an input line and two output lines. Each output line contains two stubs placed at two different positions. We derive the expressions for a selective transfer of a single propagating mode through one line keeping the other line unaffected. The analytical results are confirmed by numerical simulations
Real-time measurement system using multi-wavelength THz-wave parametric generation and detection
No full textIn this study, we achieved real-time identification of reagents using combination of machine learning and simultaneous generation and detection of multiwavelength terahertz (THz) waves by injection seeded terahertz wave parametric generator (is-TPG)
60 GHz Planar Antenna Array on Glass Substrate for WiGig Communications
No full textA planar antenna array on the RF substrate increases the level of system integration and lowers the manufacturing cost for such systems. In this paper, the authors present the design and fabrication of a planar 2×2 antenna arrayfor a 60 GHz Radio-over-Fiber (RoF) wireless system. The antenna is radiating at broadside and excited by microstrip line. For the measurement with RF probes on a wafer prober, a microstrip-to-coplanar waveguide transition is added. The measured gain of the antenna is 6 dBi and the matching is better than -20 dB at 60 GHz. The measurement and simulation results of gain and input return loss match very well at the resonance frequency
Biological Effects of Radiations and Telecommunications
No full textAccepting that the Sun doesn’t foster life just by heating, it can be asked if telecommunications technologies can possibly contribute to the endeavor of clarifying the borderline between beneficial and harmful effects of radiation in a more effective way than by dosimetry
Generation of high-quality tunable terahertz vortices based on difference frequency generation
No full textWe demonstrate a high-quality tunable terahertz (THz) vortices generation based on difference frequency generation in combination with Gaussian and vortex modes. THz vortex outputs with a topological charge of ℓTHz = ± 1 were obtained in a frequency range of 2-6 THz. The maximum average power of the THz vortex output reached up to ~3.3 μW at 4 THz
Ultrabroadband terahertz pulses from a Ge:Au photoconductive emitter
No full textUsing gold-implantated germanium, where the carrier lifetime is shortened by more than three orders of magnitude, we have demonstrated a broadband photoconductive THz emitter compatible with modelocked fiber lasers operating at wavelengths of 1.1 and 1.55 um and pulse repetition rates up to 20 MHz. The emitted THz spectrum spans up to 70Â THz. This approach opens up a prospect for manufacturing of compact, high-bandwidth THz photonic devices compatible with Si CMOS technology
Inverse Design of Plasmonic Nano-Antenna
No full textWe develop a new method for inverse design of plasmonic nano-antennas. We demonstrate the accuracy of this method for a plasmonic antenna used for heat-assisted magnetic recording (HAMR). We also use non-linear material interpolation to counter the non-physical field amplification, and filtering-and-projection regularization to ensure manufacturability of the design. Successful design of a plasmonic aperture to produce an electric field as small as 60 nm x 30 nm is presented
Synthesis of Ultra-Wide Bandgaps for 2-D Photonic Crystals of Finite Thickness
No full textThe synthesis problem of 2-D photonic crystals of finite thickness providing the ultra-wide stopbands for the plane incident waves is solved on the base of EAC-method (method of exact absorbing conditions)
A Wideband Low Profile Millimeter-Wave Antenna Fed by SICL
No full textA wide band low profile magneto-electric (ME) dipole working in millimeter wave band is presented in this paper.  Different from conventional ME dipoles using the vertical wall as magnetic dipoles, the proposed antenna’s magnetic dipole is composed of the aperture between the patches of the electric dipole. As a result, the profile of the ME dipole can be much lower than conventional ones. The proposed ME dipole antenna is fed through the ground slot by the substrate integrated coaxial line (SICL), which can significantly enhance the backside lobe performance. A simulated impedance bandwidth of 48.5% (26-42 GHz) and a gain up to 9 dBi can be achieved with a profile of about 0.12 λ0. Additionally, symmetric radiation patterns with back lobe lower than -23 dB over the operating band can be obtained. With the advantage of wide working band, low profile and low backside radiation, the proposed antenna would a good candidate for millimeter wave antenna in package (AiP) applications