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We present a terahertz camera working at 590 GHz at real-time frame-rates of 16 frames per second (fps). An array of 12×12 field-effect transistors has been fabricated in a 150-nm CMOS process and is used as the camera's image sensor. The averaged single-pixel noise-equivalent-power is 43 pW/√Hz, the voltage single-pixel responsivity is 340 V/W. For an effective power of 104 µW distributed over the...
An array of metallic posts sandwiched between two parallel metal plates supports highly-confined surface waves that can be regarded as spoof surface plasmons. This structure which is called the parallel-plate ladder waveguide (PPLWG) can be used for implementing THz guided-wave devices. In this paper, the effect of post shapes on waveguiding characteristics of PPLWG is analyzed and realization of...
We characterize InGaAs Schottky barrier diodes (SBDs) with a variation in the anode size. High-efficiency terahertz (THz) pulse detection of the InGaAs SBDs is performed in the cases of anode diameters of 2 µm and 3 µm. The uniformity of the fabricated 1 × 20 InGaAs SBD array is measured to be fine. The THz imaging results using the 1 × 20 InGaAs SBD array are presented.
A THz frequency selective microbolometer focal plane array (FPA) with 35 µm pixel pitch and a resolution of 384×288 pixels was recently developed at INO. The FPA was fabricated on a CMOS readout circuit using MEMS surface micromachining techniques. The uncooled microbolometer detectors, based on vanadium oxide technology, were optimized for detection at 4.25 THz. A high performance frequency selective...
This paper presents the use of Terahertz (THz) SPR near-field sensor based on array of sub-wavelength metallic holes and Bull's eye structure to characterize materials such as PMMA and those used in organic light emitting diode (OLED). The measurement results confirmed the theoretical SPR frequencies for metal-silicon mode and demonstrate a shift to 0.9211 THz from 0.9375 THz due to 2 µm of PMMA layer...
We design and test a switchable diffraction grating based on active metamaterials for terahertz modulation. We observe off-axis diffraction which permits operation of the device as a high-contrast modulator, with better than 20 dB of dynamic range.
In this work, we tune the frequency of the resonant peak associated to extraordinary transmission phenomenon by changing slightly the topology of typical subwavelength square apertures. By substituting the vertical lateral walls for meander-lines it is possible to move the extraordinary transmission peak downward accompanied by an unprecedented enlargement of the fractional bandwidth. This phenomenon...
We predict strong amplification of terahertz radiation by the stimulated generation of plasmons in a planar array of graphene micro/nanocavities. Amplification drastically enhances due to lateral and vertical confinement of the plasmons in graphene micro/nanocavities and superradiant nature of electromagnetic radiation from the array.
A planar dipole array on low-temperature (LT) growth gallium arsenide (GaAs) or cyclo olefin polymer film is analyzed for magnetic terahertz surface wave, TE wave propagation. A laser pulse excites the dipole gap in order to generate photo carriers on the surface of a LT-GaAs photoconductive substrate. A dipole array on the LT-GaAs substrate is designed for a surface wave around 0.40 THz. The analysis...
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 demonstrate an approach for creating reconfigurable plasmonic and metamaterial devices. As an example, this allows for dramatic changes in the transmission properties through subwavelength apertures and split ring resonators. We accomplish this by using a liquid metal that can be injected into or withdrawn from channels in an elastomeric mold.
In this paper we present a coherent detector array architecture that efficiently utilizes the available chip area to enhance signal to noise ratio. For this goal the configuration can consists multiple serially connected individual detectors that are coupled to a regularly arranged antenna matrix. The solution is scalable and can be easily customized to application specific needs e.g. microscopic...
We report the fabrication and characterization of high performance superlattice infrared photodetectors. The single-element detectors have 50% cutoff wavelengths of 5.2 µm and 8.0µm with related R0A of 7.5×104O·cm2 and 110Ωcm2, respectively at 77K. The focal plane arrays with cutoff wavelength of 5.2µm and format of 128×128, showed a noise equivalent differential temperature 33.4mK at 80K. Fabrication...
Lumped Element Kinetic Inductance Detectors (LEKID), when coupled with a silicon lens, have very high absorption efficiencies (70%) over more than one octave frequency band. In this contribution we introduce a theoretical derivation of the power received by these detectors by modeling them as an infinite array of dipoles. The theoretical model has been validated by measurements on a prototype working...
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