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Electrically tunable metamaterial modulation based on double split-ring resonators fabricated on GaAs substrate is studied experimentally and numerically. Monochromatic terahertz radiation is effectively modulated in transmission and reflection modes; experiments are complemented by measurements employing time-domain terahertz spectroscopy. Upper modulation frequency was found at 10 kHz. [ABSTRACT FROM AUTHOR]

A silicon-lens coupled bow-tie InGaAs-based diode with broken symmetry is demonstrated for terahertz imaging applications below 1 THz at room temperature. Transient features and the dynamic range of the bow-tie InGaAs-based sensor are explored experimentally, proving the possibility to use the device in real-time imaging systems. Response time is found to be less than 7 ns, responsivity of 0.1 mA/W, and noise equivalent power of 5.8 nW/√Hz. [ABSTRACT FROM AUTHOR]

A passive detection scheme for broadband, 10 GHz–2.52 THz, sensing at room temperature is demonstrated using a hemispherical silicon lens-coupled diode of an asymmetrically-shaped bow-tie geometrical form. The device is fabricated from an MBE-grown In0.54Ga0.46As wafer as mesas of 3 µm depth produced by wet etching. The detector exhibits voltage sensitivity about 5 V/W below 1 THz. [ABSTRACT FROM AUTHOR]

An approach to probe magnetic component of microwave radiation via sub-harmonic mixing in high-Tc superconductor Bi2Sr2CaCu2O8 layer is suggested. The recording principle is illustrated showing the relation between the amplitude of the mixing signal and the microwave magnetic field component in a standing-wave experiment at 9.1 GHz frequency performed close to the transition temperature Tc. [ABSTRACT FROM AUTHOR]