427 research outputs found
Ultra Fast Nonlinear Optical Tuning of Photonic Crystal Cavities
We demonstrate fast (up to 20 GHz), low power (5 ) modulation of
photonic crystal (PC) cavities in GaAs containing InAs quantum dots. Rapid
modulation through blue-shifting of the cavity resonance is achieved via free
carrier injection by an above-band picosecond laser pulse. Slow tuning by
several linewidths due to laser-induced heating is also demonstrated
Local On-Chip Temperature Tuning of InGaAs Quantum Dots
Quantum network based on InGaAs quantum dots (QDs) rely on QDs being in resonance with each other. We developed a new technique based on temperature tuning to spectrally align QDs located on the same chip
An optical modulator based on a single strongly coupled quantum dot - cavity system in a p-i-n junction
We demonstrate an optical modulator based on a single quantum dot strongly coupled to a photonic crystal cavity. A vertical p-i-n junction is used to tune the quantum dot and thereby modulate the cavity transmission, with a measured instrument-limited response time of 13 ns. A modulator based on a single quantum dot promises operation at high bandwidth and low power
Local Quantum Dot Tuning on Photonic Crystal Chips
Quantum networks based on InGaAs quantum dots embedded in photonic crystal
devices rely on QDs being in resonance with each other and with the cavities
they are embedded in. We developed a new technique based on temperature tuning
to spectrally align different quantum dots located on the same chip. The
technique allows for up to 1.8nm reversible on-chip quantum dot tuning
Linewidth broadening of a quantum dot coupled to an off-resonant cavity
We study the coupling between a photonic crystal cavity and an off-resonant
quantum dot under resonant excitation of the cavity or the quantum dot.
Linewidths of the quantum dot and the cavity as a function of the excitation
laser power are measured. We show that the linewidth of the quantum dot,
measured by observing the cavity emission, is significantly broadened compared
to the theoretical estimate. This indicates additional incoherent coupling
between the quantum dot and the cavity.Comment: 5 pages, 4 figure
Resonant Excitation of a Quantum Dot Strongly Coupled to a Photonic Crystal Nanocavity
We describe the resonant excitation of a single quantum dot that is strongly coupled to a photonic crystal nanocavity. The cavity represents a spectral window for resonantly probing the optical transitions of the quantum dot. We observe narrow absorption lines attributed to the single and biexcition quantum dot transitions and measure antibunched population of the detuned cavity mode [g^(2)(0)=0.19]
Optical manipulation of quantum dot excitons strongly coupled to photonic crystal cavities
In this paper, we review some recent cavity quantum electrodynamic (CQED) experiments with single quantum
dot exciton coupled to photonic crystal cavities, performed in our group. We show how the coupled quantum-dot/cavity system can be used to modulate light with at a very fundamental level with very low power and
discuss some applications of these low power modulators
Quantum and classical information processing with a single quantum dot in photonic crystal cavity
The experiments show that the coupled QD-cavity system is a promising candidate for probing CQED as well as for optical information processing. Our present work includes building of a three level system in a QD coupled to cavity, which is essential for construction of any quantum information processing devices
Independent electrical tuning of separated quantum dots in coupled photonic crystal cavities
Systems of photonic crystal cavities coupled to quantum dots are a promising
architecture for quantum networking and quantum simulators. The ability to
independently tune the frequencies of laterally separated quantum dots is a
crucial component of such a scheme. Here, we demonstrate independent tuning of
laterally separated quantum dots in photonic crystal cavities coupled by
in-plane waveguides by implanting lines of protons which serve to electrically
isolate different sections of a diode structure.Comment: 3 pages, 3 figure
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