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We fabricate arrays of diamond nanopillars containing single SiV− centers with high yield and spectral stability, and perform ultrafast, all-optical complete coherent control over the state of individual SiV− centers on picosecond timescales. We demonstrate Rabi oscillation, Ramsey interference, and full SU(2) control over the qubit state.
We investigate the effects of homodyne interference on light transmitted through a dissipative Jaynes-Cummings system and use quantum optical simulations to show how interference can dramatically improve the generation of high-quality single photons.
We demonstrate the generation of single- and two-photons at a time from a quantum dot-photonic crystal resonator system. Controlling the detuning between emitter and cavity allows us to drive a nonlinear ladder of hybridized light-matter states.
We present the Ge Zener-Emitter injection mechanism for synthesis of an indirect semiconductor optical amplifier (ISOA), featuring gain characteristics and electro-absorption modulation with extinction ratios > 14 dB by sufficient Moss-Burstein shift, for generic Ge-on-Si Photonics platform.
We present an experimental realization of an integrated biosensor consisting of a Ge PIN photodetector with an Al nanohole array in its contact metal layer. The device responsivity strongly depends on the surrounding refractive index, making the device suitable for integrated sensing at reduced size.
We present an empirical PDE model for the description of the interplay between total current and heat flow in large-area organic LEDs, which can lead to unwanted spatial brightness in homogeneities. The model resolves the different layers in the OLED stack by taking their individual IV characteristics into account. In particular, the electrical conductivity features a field dependence to incorporate...
On-demand single-photon sources that produce a single photon as a response to a deterministic input are widely regarded as critical light sources for quantum key distribution, quantum repeaters, and quantum information science generally [1]. The wavepackets from such a source must have low probability to contain more than one photon, exist in a pure state so they may interfere with one another, and...
While modulators, waveguides and detectors have been successfully integrated in silicon devices, a laser source still remains a challenge. Unfortunately, in silicon and germanium, indirect band transitions are favored, making laser emission unlikely. Direct bandgap transitions have recently been demonstrated in germanium by introducing tensile strain with heavy n-type doping or by alloying with Sn...
In this paper we report experimental results on the fabrication and characterization of vertical Ge gate-all-around p-channel TFETs, utilizing GeSn as a channel material. Through two sample series, the potential and challenges of implementing the low-band gap material GeSn are reviewed. It is verified that ION can be effectively enhanced by increasing the Sn-content in the GeSn-channel, due to increasing...
The reliability of microelectronic devices is often limited by internal local delamination that occurs between the polyimide layer and the re-distribution top metal layer on the chip surface during temperature cycle testing. In order to design reliable microelectronic packages and to avoid additional delay and cost of potential re-designs, such effects should be thoroughly analyzed, understood and...
We investigated an ultrafast phonon-assisted population transfer between polaritons from a strongly coupled quantum dot-photonic crystal cavity system. In particular, we demonstrated complete coherent control and single-photon generation from a polariton.
Indistinguishable photon emission was investigated from a quantum dot-photonic crystal resonator system for the first time. This solid-state cavity quantum electrodynamical platform produced robust and high-fidelity generation of indistinguishable photons at unprecedented rates.
In this paper, we study the effect of the localized surface plasmon resonance (LSPR) of two types of metallic nanoparticles (NPs) on the organic light-emitting diodes (OLED) performances. Numerical and experimental results will be presented.
We report on the first experimental demonstration of a monolithic integrated Group-IV Ge semiconductor optical amplifier (SOA) — the Ge Zener-Emitter (ZE). The ZE is a device featuring light amplification up to 4.7 dB (92 mA) at center wavelength of 1700 nm and gain-bandwidth of 98 nm on Si (100). Our novel direct Zener band-to-band tunneling (BTBT) injection method enables low-voltage electron emission...
While monolithically integrated light sources for Si photonics have been investigated using Ge and GeSn on Si substrates [1-3], the challenges in material quality and efficiency remain to be solved. Turning the Group-IV material into a direct semiconductor for CMOS compatible concepts [4] promises enhanced electrical to optical conversion efficiencies. However, the red-shift in emitting wavelength...
Rogue waves are observed in a 980 nm laser diode subject to filtered optical feedback via an FBG. A rogue-wave map is established experimentally as a function of the optical feedback ratio and the laser current.
A highly detailed and extended map of low frequency fluctuations is established for a high power multi-mode 980nm laser diode subject to filtered optical feedback from a fibre Bragg grating. The low frequency fluctuations limits and substructures exhibit substantial differences with previous works.
For finite-dimensional discrete-time positive systems the complex and real stability radius coincide. This was recently proven by Hinrichsen and Son. In this note we generalize this result to infinite-dimensional discrete-time positive systems on Banach lattices. Furthermore, we provide a simple formula for the stability radius of positive systems which is a counterpart of the finite-dimensional case.
This paper describes a CELP speech-coding algorithm which makes use of a specific signal classifier especially designed for this purpose. The classification method is based on the Dyadic Wavelet Transform (DyWT) and has proved to be superior to common classifiers that use the open-loop long-term prediction gain for mode selection. The classifier's output is used for the control of several coder parameters,...
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