The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We investigate optical spin pumping of self-assembled p-type δ-doped InAs quantum dots as well as site-controlled InP nanowire quantum dots and find that they are both promising for scalable quantum information processing platforms.
Efficient silicon (Si)-compatible emitters can realize inexpensive light sources for a variety of applications. In this paper, we study both photonic crystal (PC) and plasmonic nanocavities that enhance the emission of Si-compatible materials. In particular, we examine the coupling of silicon nanocrystals (Si-NCs) to silicon nitride PC cavities and Si-NCs in silicon dioxide to plasmonic gratings,...
Light emission at 1.54 mum from Er-doped amorphous silicon nitride layer coupled to high quality factor photonic crystal resonators is studied. Resonances exhibit line-width narrowing with pump power, signifying differential gain in the material.
Up to 2.3% biaxial tensile-strained Ge layers have been grown on InGaAs/GaAs buffer layers. A dramatic increase in low temperature photoluminescence intensity for >2% strained Ge confirms the existence of a direct band gap Ge.
The design of a photonic crystal photovoltaic device is described. We discuss the feasibility of demonstrating that inhibition of spontaneous emission can be used to increase the efficiency of solar cells.
The reflectivity of a photonic crystal cavity is modified using a single coupled quantum dot. We demonstrate electrical modulation by controlling the state of the quantum dot using a lateral electric field.
We present calculations and proposals for two-photon transition rate enhancement in quantum dots coupled to photonic crystal cavities. Cavity-assisted two-photon absorption and emission are efficient methods to coherently excite quantum dots and generate indistinguishable single photons.
Methods to improve single photon generation via photon-blockade in a photonic-crystal cavity with a strongly coupled quantum-dot are presented. With realistic system parameters, significant improvement in second-order-auto-correlation g2 (0) (from 0.93 to 0.79) is achieved.
We report up to 2.3% biaxial tensile-strained Ge layers grown on InGaAs/GaAs buffer layers. Low-temperature photoluminescence shows a dramatic intensity increase for >2% tensile strained Ge, confirming the existence of a direct band gap Ge.
We propose to use plasmonic modes in a periodic metal-insulator-metal configuration with metallic gratings to enhance emission from silicon nanocrystals. The modification of emission with a change in grating periodicity is experimentally demonstrated.
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.
Photonic crystal nanocavities with resonances in the visible and near-IR couple easily to nearby fluorescent molecules. Photoluminescence spectra demonstrate that the cavities, fabricated in a gallium phosphide membrane, have quality factors up to 11,000.
Photonic crystal nanocavities at visible wavelengths are fabricated in a high refractive index gallium phosphide membrane. The cavities show resonances at wavelengths as low as 645 nm at room temperature, with quality factors 500-1700.
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 propose to use low group velocity modes on a surface plasmon grating to mediate emission from a variety of emitters. We demonstrate the modification of coupling as the grating periodicity is changed.
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 fabricated photonic crystal nanocavities to enhance erbium (Er) emission in silicon rich nitride nanocrystals. We observed experimental quality factors of ~6000 and 20-fold enhancement, in agreement with numerical calculations of the Purcell effect.
We propose to use low group velocity modes on a surface plasmon grating to mediate emission from colloidal quantum dots. We demonstrate the modification of emission wavelength and coupling as the grating periodicity is changed.
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.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.