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The near-field tip-antenna enhanced signal transduction with femtosecond laser pulses allows for spatio-spectral and spatio-temporal imaging and quantum coherent control with the perspective to reach the single electronic or vibrational quantum level.
Strong quasi-cw terahertz fields accelerate and recollide electron-hole pairs injected by a near-ir laser into GaAs quantum wells. A frequency comb is emitted, with up to 18 teeth separated by twice the terahertz frequency.
Newly discovered 2D semiconductors offer a platform to investigate valley excitons at the two dimensional limit. Here, we present optoelectronic control of valley exciton polarization and coherence, and their device applications in monolayer limit.
We demonstrate stimulated polariton emission at room temperature in a dielectric microcavity embedded with ZnO nanoparticles. The polariton lifetime is also shown to decrease drastically above the stimulated emission threshold.
Fast tuning of the Optical Angular Momentum (OAM) order of a vortex beam is demonstrated with 20µs switching times using a compact silicon photonic device.
We demonstrate a 2D grating emitter that emits circularly polarized light beam synthesized from a waveguide mode. A micro-heater is integrated to control handedness of the circularly polarized light. The device shows emission efficiency of about 8%, while simulations predict much higher efficiency of 72% with ideal conditions. Such a device could serve as an interface between silicon photonic waveguides...
We have obtained record gain of 60 dB with a continuous-wave two-pump fiber optical parametric amplifier, over a 5.5-nm bandwidth. We used a 500-m long fiber, and 1.5 W of pump power.
Recent advances in quantum dot based quantum technology are presented: scalable fabrication of bright sources of single photons or entangled photon pairs, optical non-linearities at the few photon scales and first implementations of quantum gates.
Experimental evidence of enhanced spontaneous emission from InP coupled to an optical antenna is presented. Photoluminescence measurements show a 120x increase in light emission from antenna-coupled devices over bare InP emitters.
Giant gain enhancement effect of surface plasmon polaritons (SPPs) on terahertz (THz) stimulated emission in optically pumped monolayer graphene has been experimentally studied. We observed the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. It was clearly observed that an intense THz probe pulse was detected only at the area...
Ultra-intense optical parametric chirped-pulse amplification (OPCPA) requires a high-performance front end at 910 nm. Progress on developing a white-light-seeded chain of noncollinear optical parametric amplifiers (NOPA's) and a cylindrical Offner stretcher is presented.
We present an ultra-broadband OPCPA system operating at 3.4 µm delivering 41.6-fs pulses. The average output power is currently 600 mW, corresponding to 12 µJ of pulse energy at a repetition rate of 50 kHz.
We propose a radically new way of rogue wave control, modifying the statistical distribution of events via suitable injection of dispersive waves. This allows reducing the frequency of rogue events rather than only increasing it.
We have developed a cathodoluminescence-based single photon emitter detection scheme with deep subwavelength resolution. Application to NV0 centers in diamond and a new type of emitter in hexagonal Boron Nitride is presented.
We demonstrate strong anharmonicity of the polariton dressed states in a highly dissipative cavity quantum electrodynamics system via dark state resonances. Vacuum Rabi oscillation and photon blockade occur even for decay-to-interaction rate ratio exceeding 100.
One of the central assumptions in quantum electrodynamics is to invoke the dipole approximation because (quantum) emitters are much smaller than the wavelength of light. The main consequence is that only the electric dipole plays a role in light-matter interactions at optical frequencies. In this paper we show that semiconductor quantum dots possess large magnetic-dipole and electric-quadrupole moments,...
300 W CW linearly-polarized 1120 nm laser is achieved with an integrated Yb-Raman fiber amplifier. 86 W 1178 nm single frequency Raman fiber amplifier is generated and frequency doubled to 589 nm with power up to 52.7 W.
We demonstrate a graphene mode-locked fiber laser system generating 42 fs pulses with 53mW output power, ideal for high temporal resolution applications.
Seed pulses at nJ-level of a fiber-based pre-amplified Thulium oscillator are amplified to µJ-level at 1 kHz repetition rate in a regenerative amplifier based on a Thulium-doped YAP crystal with 355 fs compressed pulse duration.
We propose and demonstrate improvement of optical signal-to-noise ratio of a high-power pump by saturated stimulated Brillouin amplification of a backward seed in a fiber. A 27-dB improvement was obtained for a 1-W pump.
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