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We demonstrate all-optical switching based on a single quantum dot coupled to a photonic crystal cavity. The quantum-dot mediated interaction between the signal and control beams occurs at the single-photon level.
A photonic crystal cavity with a strongly coupled quantum dot is coherently driven using short laser pulses. Depending on the driving frequency, photon blockade or photon induced tunneling is observed. These nonlinear phenomena at single photon level are used for on-chip generation of nonclassical light.
We coherently probe a quantum dot that is strongly coupled to a photonic crystal nano-cavity by scattering of a resonant laser beam. The coupled systempsilas response is highly nonlinear as the quantum dot saturation with nearly one photon per cavity lifetime. This coherent probing method has applications for classical and quantum information processing.
A weakly coupled quantum dot is used to control the transmission from a photonic crystal resonator into a photonic crystal waveguide. On-chip integration of local temperature tuning elements and efficient out-coupling with an integrated grating structure are demonstrated.
We coherently probe a quantum dot, strongly coupled to a photonic crystal nano-cavity, using a resonant laser beam. At higher pump power, the coupled systempsilas response becomes highly nonlinear. This coherent probing method has applications for classical and quantum information processing.
A high-density colloidal quantum dot film emitting at telecom wavelengths is evanescently coupled to a Si photonic crystal cavity, and the possibility of making a laser from the structure is discussed.
An InAs quantum dot inside a photonic crystal cavity in the regime of weak coupling modulates the intensity of a resonant beam by 50%, and is nonlinear at powers of one photon per lifetime.
Efficiency and speed of photonic crystal lasers are improved by passivating InGaAs/GaAs membranes using (NH4)S treatment. Lasers show five-fold reduction in nonradiative surface recombination rate, resulting in four-fold reduction in threshold and room-temperature operation with near THz response.
In this work, the authors extend a previously reported one-dimensional method to the full plane of the photonic crystal, and apply it to photonic crystal cavity design. The authors started with a desired field which, for cavities, is chosen according to a simple radiation-density expression to minimize total internal reflection losses.
Summary form only given. Photonic crystals (PCs) allow unprecedented control over radiative properties of embedded emitters. High-Q cavities defined in PCs confine photons to small volume, enabling strong light-matter interaction. Lasers in particular stand to gain considerably through decreased lasing threshold, modulation rate, cost, form factor, and device integration. We discuss a THz-modulation...
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.
We describe an analytic method for designing photonic crystal structures and apply it to high-Q cavities. Starting from a Bloch mode of a photonic crystal or waveguide, we derive a perturbative two-dimensional structure to confine a desired mode.
A rate equation model is used to predict the maximum modulation rate of a quantum dot photonic crystal laser. We predict that the modulation rate is limited by the carrier capture rate into the dots.
We demonstrate fast (up to 20 GHz), low power (5 muW) modulation of photonic crystal cavities in GaAs containing InAs quantum dots. Modulation is achieved via free carrier injection by an above-band picosecond laser pulse.
Photonic crystal (PC) cavities enable localization of light into volumes (V) below a cubic optical wavelength (smaller than any other types of optical resonators) with high quality (Q) factors. This permits a strong interaction of light and matter, which is relevant for construction of classical light sources with improved properties (e.g., low threshold lasers) and of nonclassical light sources (such...
We designed photonic crystal cavities for coupling to colloidal quantum dots suspended in a polymer film. We experimentally observe the coupling of quantum dot emission to cavity modes at room temperature.
We design efficient photonic crystal (PC) cavity-waveguide couplers using the Fourier-space optimization. This system is a fundamental building block for integrated photonic circuits with direct applications in quantum information processing.
GaAs terahertz (THz) photonic crystal (PC) slabs are fabricated. A spatially patterned femtosecond laser beam generates THz radiation inside the PCs. THz emission from dasialeaky modespsila above the light line is observed.
We will discuss our experimental and theoretical work on a number of solid-state quantum information processing devices enabled by combining nanophotonic structures - photonic crystals with artificial atoms (such as quantum dots).
An inverse problem approach to designing photonic crystal cavities is reviewed. The theoretical and experimental work on integration of a number of photonic crystal components (cavities and waveguides) into functional circuits for quantum information processing, including nontrivial two-qubit quantum gates is also reviewed
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