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26 Nov 2021 • Conference Paper • 2021 27th International Semiconductor Laser Conference (ISLC)
Quantum coherent revival in a room-temperature quantum-dot optical amplifier: a route towards practical quantum information processing
AbstractThe hallmark quantum-optics phenomenon: quantum coherent revival was demonstrated in room-temperature quantum dot optical amplifiers. The revival originates from coherent excitation of, and interaction among, homogeneous subgroups within an inhomogeneous ensemble, which play the role of a multi qubits platform for practical quantum information processing.
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26 Aug 2021 • Preprint • Science
Imprinting the quantum statistics of photons on free electrons
AbstractThe interaction between free electrons and light stands at the base of both classical and quantum physics, with applications in free-electron acceleration, radiation sources, and electron microscopy. Yet to this day, all experiments involving free-electron–light interactions are fully explained by describing the light as a classical wave. We observed quantum statistics
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15 Aug 2021 • Preprint • arXiv
On the carrier transport and radiative recombination mechanisms in tunneling injection quantum dot lasers
AbstractWe report temperature-dependent current-voltage (I - V - T) and output light power-voltage or current (P - V - T) or (P - I - T) characteristics of 1550 nm tunneling injection quantum dot (TI QD) laser diodes. Experimental data is accompanied by physical models that distinguish between different current flow and light emission mechanisms for different applied voltages
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20 Jul 2021 • Journal Article • Physical Review Research
Room-temperature coherent revival in an ensemble of quantum dots
AbstractWe demonstrate the hallmark concept of periodic collapse and revival of coherence in a room-temperature ensemble of quantum dots (QDs) in the form of a 1.5-mm-long optical amplifier. Femtosecond excitation pulses induce coherent interactions with a number of discrete homogeneous QD subgroups within an inhomogeneously broadened ensemble, which interfere constructively
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27 Jan 2021 • Journal Article • IEEE Nanotechnology Magazine
1.5-μm Indium Phosphide-Based Quantum Dot Lasers and Optical Amplifiers: The Impact of Atom-Like Optical Gain Material for Optoelectronics Devices
AbstractUsing quantum dot (QD) structures as active material for optoelectronics was already in focus before the development of quantum well (QW) lasers and before semiconductor lasers occupied an important place in the market. The big step in reducing laser threshold conditions by substituting bulk gain materials with QWs should find a logical continuation by further reducing
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Sep 2020 • Conference Paper • 2020 IEEE Photonics Conference (IPC)
High Resolution, Fast Measurement of an Arbitrary Optical Pulse using Dual Comb Spectroscopy
AbstractA technique to characterize arbitrary optical pulses based on dual comb spectroscopy was developed. We benchmark the method by comparison with conventional characterization methods. The limitations due to fluctuations of phase noise and timing jitters are overcome by implementing computational non-uniform sampling of measured interferograms.
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19 Aug 2020 • Journal Article • Journal of Applied Physics
Highly accurate tuning of current–voltage characteristic shift in a photo-sensitive three terminal metal–insulator–semiconductor device
AbstractWe present a planar three terminal device fabricated on a silicon-on-insulator substrate. The device is based on a two-layer dielectric stack comprising SiO2 tunneling and HfO2 layers. A so-called gate electrode is placed between two other contacts, of the source and drain, all deposited on the insulator stack. In the dark as well as under illumination, the current–voltage
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21 Jul 2020 • Journal Article • Physical Review Applied
Fast High-Resolution Measurement of an Arbitrary Optical Pulse Using Dual-Comb Spectroscopy
AbstractWe present amplitude and phase characterization of short optical pulses using dual-comb spectroscopy, where one comb is a well-characterized stable-frequency comb and the second is the pulse source to be measured. We demonstrate that the technique is suitable for truly arbitrary repetition rates of the two combs. Moreover, the system is highly sensitive and is shown to
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May 2020 • Conference Paper • Conference on Lasers and Electro Optics
Co-Occurrence of Resonance and Non-Resonance Tunneling Injection Processes in Quantum Dot Gain Media
AbstractResonance and non-resonance tunneling processes in tunneling injection quantum dot gain media were demonstrated, to occur simultaneously. Our finding sheds light on the basic tunneling injection schemes and their proper utilization in quantum dot lasers.
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1 May 2020 • Conference Paper • Conference on Lasers and Electro Optics
Dual Comb Spectroscopy for Characterization of Short Optical Pulses
AbstractA technique to characterize arbitrary optical pulses based on dual comb spectroscopy was developed. Distortions due to timing and phase fluctuations were determined and a method to compensate for them was demonstrated.