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We demonstrate on-chip multi-channel phase-sensitive amplification in a nonlinear waveguide, achieving 5 dB net gain and 15 dB extinction ratio. We show the manipulation of individual channels in a multi-channel scheme through controlling the initial phases.
The spectral fingerprint of ibuprofen within the THz frequency window has been retrieved through an ultra-broadband THz Time Domain Spectrometry set-up. The latter implements the Solid State Biased Coherent Detection scheme, based on a compact CMOS-compatible integrated device. Such a technique shows unprecedented advantages in term of bandwidth (greater than 10 THz) over other solid state methods...
Phase-sensitive amplification (PSA) is a nonlinear optical interaction providing attractive functionalities for all-optical classical and quantum signal processing with a wide range of promising applications, such as regeneration of high modulation formats [1] and amplification of entangled single-photon sources [2]. To exploit PSA in a scalable and compact implementation, this technique has been...
We report on the numerical investigation and analytical modeling of tapered terahertz nanoantennas. We show that the maximum field enhancement at the antenna tip is achieved for small taper angles rather than in a more traditional dipolar (wire-like) geometry.
We report here on the design, fabrication and characterization of out-of-plane arrays of conical nanoantennas resonating in the terahertz frequency range.
We report laser-guided electric discharges along curved trajectories, and hence around obstacles in line of sight between electrodes. Furthermore, beam self-healing enables direct discharge on target even when the laser beam directly hits the obstacle.
Photonic integrated circuits that exploit nonlinear optics in order to generate and process signals all-optically have achieved performance far superior to that possible electronically — particularly with respect to speed. Although silicon-on-insulator has been the leading platform for nonlinear optics for some time, its high two-photon absorption at telecommunications wavelengths poses a fundamental...
We present an analytical model carefully describing the time-frequency behavior of all the stages composing our whole Terahertz Time Domain Spectroscopy laser based system, from the THz pulses generation via Optical Rectification, to their detection through Electro-Optic Sampling technique, by way of diffraction, collecting and focusing effects. In order to prove the effectiveness of our work, we...
We investigate the terahertz generation efficiency dependence as function of the pulse width durations at 800 nm. Our results confirmed conversion efficiency of 0.35% with saturation at 240 fs of pulse width duration.
An all-optical, sub-wavelength terahertz characterization technique based on an ultra-thin-knife-edge is demonstrated employing ultraviolet-pulse to project the blade image on a ZnTe crystal, where the free carriers excited on a blade-shaped area act as field-shield.
We report temperature dependence and thermal hysteresis behavior of terahertz transmission through photoexcited graphene. We vary the temperature between room temperature and 1800°C, and use the optical-pump/terahertz-probe differential transmission technique.
We demonstrate a novel technique for improving the signal-to-noise ratio of terahertz detection, based on self-referencing spectral-domain interferometry. We test and compare the terahertz electric field measured using this method with standard electro-optic sampling technique.
We demonstrate novel microcavity lasers in an integrated, CMOS compatible platform. This platform has promise for telecommunications and on-chip WDM optical interconnects.
We report nonlinear terahertz effects in monolayer graphene using intense few-cycle THz pulses. We observe enhancement in the THz transmission through graphene when we increase the THz electric field. Following photo-excitation, we observed reduction in the THz transmission. This photo-induced reduction in the THz transmission is found to decrease when we increase the THz electric field.
A potential solution for the demand for highly stable pulsed lasers at hundreds of GHz repetition rates is represented by passively mode locked fiber lasers. These lasers are composed of a band-limited amplifier, a dispersive element and a nonlinear element. When a high finesse resonant filter is added intracavity, they emit pulses with a repetition rate equal to the filter free spectral range (FSR)...
Truncated Airy pulses [1-3] were launched in an optical fiber close to its zero dispersion point allowing the effect of third order dispersion (TOD) to play a dominant role in the dynamics of pulses. When the truncated Airy pulse propagates in the presence of pure quadratic dispersion it lives for a finite distance until it reaches its divergence area (Fig.1(a)). However when the pulse dynamics is...
We experimentally demonstrate an isolator based on a magnetic non-reciprocal retarder operating with broadband terahertz pulses. Our device depends on permanently magnetized Strontium Iron Oxide, where Faraday rotations up to (194º/T) were obtained.
We demonstrate self-referenced spectral-domain interferometry (SDI) for terahertz detection. It not only overcomes the limitation of over-rotation for intense terahertz fields, but also considerably increases the signal-to-noise ratio, when compared with conventional SDI techniques.
Phase Reconstruction using Optical Ultrafast Differentiation (PROUD) is implemented using an integrated Mach-Zehnder Interferometer, demonstrating self-referenced phase characterization of GHz-rate complex (up to 4-level amplitude and 4-level phase) modulation signals in a single-shot and real-time.
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