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We demonstrate the first fully solid-state technique for the coherent detection of ultrabroadband THz pulses (0.1–10 THz), relying on the electric-field-induced second-harmonic generation attained in integrated CMOS-compatible devices.
In this contribution, we will review our recent activities in the development of double nested cavity lasers. Several stable operating regimes can be achieved over a wide range of conditions.
Surface states have a fundamental role in many modem technologies as well as in the field-matter interaction exhibited by material surfaces. Their manipulation can be used to functionalise surfaces into devices, enabling or enhancing specific physical mechanism [1]. Many rising technologies, such as photovoltaic metasurfaces, rely on thin-layer semiconductors [2, 3]. Most semiconductor surfaces exhibit...
Optical frequency combs in microresonators [1] or microcombs have generated significant attention in recent decades. Specifically, microcombs can be generated by resonantly coupling a powerful CW laser light in a microcavity, inducing multiple frequency oscillation by parametric generation. A well-known route to comb generation starts from the modulation instability (MI) of the pump. MI generates...
Microresonator based frequency combs or microcombs have attracted considerable interest in recent years as they would benefit a widespread of applications including high speed communication system, metrology, ultrafast optical clocks and on chip optical signal processing. A great amount of work on microcombs has been done in the past few years; coherent sources based on optical parametric generation...
Filter-Driven four wave mixing (FD-FWM) lasers based on microresonators are a family of mode-locked lasers capable of exciting multiple pulses per main cavity round trip [1]. They are capable of a stable output at hundreds of GHz repetition rates. Potential applications of such a laser include frequency comb generation and optical clocks [2]. We present the results of the characterisation of the FSR...
The interplay between ultrafast and slow nonlinearities, like Kerr and thermo-optical nonlinearities, is well-known for generating bistability, self-pulsing and chaotic regimes in optical microcavities. These effects have been observed in different kinds of devices, such as doped silica glass optical microcavities with high refractive index [1], and numerical models have been investigated to provide...
We report the characterization of a balanced ultrafast photodetector. For this purpose, we use a recently developed time-domain laser-based vector network analyzer (VNA) to determine the common-mode rejection ratio (CMRR) of the device under test. This includes the frequency-domain response above the single-mode frequency of the coaxial connector. Although the balanced photodetector has a nominal...
We demonstrated solid-state broadband coherent Terahertz characterization based on the Terahertz Field Induced Second Harmonic effect in Silica. The THz detector consists of an asymmetric micro-slit array which can be operated at 200V applied bias.
We experimentally demonstrated the bistability and multi-stability in a 5th order cascaded CMOS compatible ring resonator. The shape evolution of the filter under different states is also investigated.
We demonstrated a 1.81 µm mode-locked laser using a carbon nanotube and an integrated 11-th order microring resonator. A mode-locked pulse train centered at 1.81 µm with repetition rate of 12.6 MHz is achieved.
We demonstrated coherent Terahertz characterization based on the Terahertz Field Induced Second Harmonic effect in few microns thick Silica (SiO2) samples that can be easily operated with as little as a few hundred Volts. Our sample is an infinitely long 30 μm slit written in gold. The underlying idea of our work is that of exploiting the large breakdown voltage and the high nonlinearity of glass...
In this talk, the physics of microring resonators is discussed in the classical and quantum regimes, in the context of the exploitation of chi-3 effects in these cavities as done by our group. Through the implementation of a novel microring pumping scheme and a quantum reinterpretation of the frequency comb, we present an integrated platform for the generation of quantum optical states spread over...
We report an integrated, CMOS-compatible source of multiplexed heralded photons, distributed over several wavelengths at standard communication channels and compatible with quantum memories. Our system operates in a self-locked mode without an external pump laser.
We demonstrated a new regime of operation for ultrafast mode-locked lasers that we termed “burst-mode” modelocking. By exploiting an integrated 11th order micro-ring resonator, our scheme achieves stable operation resulting in a mode-locked train of pulses at 650 GHz with a burst mode envelope of 40 ps at 7.12 MHz.
We demonstrated coherent Terahertz characterization based on Terahertz Field Induced Second Harmonic effect in few microns thick Silica (SiO2) samples that can be easily operated with 10–100 V sources. Our sample is an infinitely long 30 µm slit written in gold. The underlying idea of our work is that of exploiting the large breakdown voltage and the high nonlinearity of glass to achieve a large signal...
We report an integrated, CMOS-compatible source of multiple and independent photon pairs at different wavelengths compatible with standard fiber communication channels and quantum memories. It operates in a self-locked mode with no external pump laser.
We demonstrate orthogonally polarized photon pair generation via spontaneous non-degenerate four-wave-mixing (FWM) of orthogonally polarized pumps in a CMOS compatible micro-ring resonator by fully suppressing stimulated FWM. Photon coincidences and optical parametric oscillation are measured.
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