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A kind of ultra-wide band-pass terahertz filter constructed by drilling annular holes on the metallic strips is proposed. The dispersion curves and S-parameters of the proposed filter are investigated in detail. Compared with the rectangular grooves, the results of the proposed structure demonstrate stronger field confinement and more excellent propagation performance in frequency range from 0.12THz...
We have developed a stable two-mode laser by using a quantum dot optical gain chip in an external cavity. In this study, we demonstrate continuous change of frequency separation of a two-mode laser by using a birefringent etalon filter. Since the polarization of the quantum dot optical gain chip is TE-dominant, the frequency separation of the two-mode laser is controlled by rotating the birefringent...
We introduce the use of Time-Frequency (TF) filtering applied to Terahertz Time-Domain Spectroscopy (THz-TDS) data in order to extract valuable information hidden into the noise floor. The Short Time Fourier Transform (STFT) provides a spectrum analysis in time, we optimized its Gaussian window in order to analyse and filter the THz signals of substances. The formalism presented allows an efficient...
Spatially resolved terahertz measurements usually require either mechanical scanning, large and expensive detector arrays, or a combination thereof. So called single pixel cameras (SPCs), consisting mainly of a spatial light modulator (SLM) and a single pixel detector, provide an alternative approach. The SLM is a dynamically reconfigurable spatial filter. For a successful image acquisition, the setup,...
Microwave kinetic inductance detectors (MKIDs) promise high sensitivity, combined with device simplicity and intrinsic multiplexibility. We demonstrate in this paper the realization of an imaging system consisting of an array of 961 antenna-coupled MKIDs that is read out using a single pair of coax cables and an analogue-digital back-end with a 2 GHz readout bandwidth. We measure the optical NEP of...
We present the development of background limited kinetic inductance detectors (KIDs) for THz astronomy applications to be used in space based observatories. The THz radiation is coupled to the KID via a leaky wave antenna covering the frequency range from 1.4 to 2.8 THz. We have developed a hybrid niobium titanium nitride/aluminium (NbTiN/Al) KID, fabricated on a silicon (Si) substrate, in which the...
The aim of this work is to improve high-frequency calibration data on long baseline observations for the ALMA antennas. A dual-frequency atmospheric phase error calibration method is proposed and will be implemented by the simultaneous observation in two ALMA Bands, specifically 6 and 9, coupled by means external optics in a few baselines. This method is envisioned to demonstrate the advantage of...
Separating and detecting specific polarisations at multiple frequencies can be required for a number of scientific cases. However, in some cases, constraints on polarisation are defined by the choice of detectors used. In this paper we will present two devices that have been designed and built to increase performance when designing an optical system with these constrains. They are a polarisation sensitive...
We present the first demonstration of 100-m distance wireless link at single-channel data rates up to 50 Gbit/s using photonics-based 300-GHz-band coherent transmitter. An error-free transmission has been achieved at 30 Gbit/s with a transmitter power of only −15 dBm with a carrier frequency of 320 GHz.
For simultaneous stabilization of a set of cw-THz source devices oscillating at different frequencies, a number of frequency reference sources are required. In this paper, we propose a multi-frequency reference source based on Mach-Zehnder-modulator-based flat comb generator (MZ-FCG) combined with a programmable optical filter (POF). An optical comb generated by the MZ-FCG was spectrally-synthesized...
High-energy pulses at 1.28 μm are demonstrated by stimulated Raman scattering in hydrogen using two chirped pulses of a Ti: Sapphire laser. The Stokes pulse carrying record-high energy of 4.4 mJ is recompressed to 80 fs.
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