25 Oct 2019
The nanostructures and dynamics of thin water layers on oxide are revealed by optical whispering-gallery-mode resonances in a microtube cavity.
16 Oct 2019
The transfer of entanglement between distant photons generated by semiconductor quantum dots has been realized for the first time, representing a major step towards secure communication and long-range quantum state transfer.
31 Jul 2018
New broadband optical antenna for highly efficient extraction of entangled photons with a yield of 37% per pulse.
9 Apr 2018
In situ generation of silver nanoparticles for selective coupling between localized plasmonic resonances and whispering-gallery modes is demonstrated by spatially resolved laser dewetting on microtube surfaces.
26 May 2017
Epitaxial GaAs quantum dots are optimized to such a degree that all of them emit entangled photons on demand upon illumination with light.
A property that may prove relevant for quantum communication technologies.
24 Jan 2017
Monolithically integrated vertical ring resonators pave the way for optofluidics in three-dimensions on photonic chips.
30 Aug 2016
The single photon emission from a single III-V quantum dot (QD) is tuned into resonance with that of another QD by a fully Si-integrated MEMS platform .
23 Jun 2016
Selective coupling of localized surface plasmons and resonant optical modes is achieved in cleverly patterned microtubular optical cavities.
18 Mar 2016
We enable spin-orbit coupling of light confined to a closed path within an asymmetric optical microcavity and demonstrate a non-cyclic Berry phase acquired in a non-Abelian evolution.
27 Jan 2016
With a silicon MEMS device we shift the entangled photon emission from a quantum dot by more than 3000 times of its radiative linewidth without spoiling the entanglement.
We demonstrate strain-tunable entangled-light-emitting-diodes operating at frequencies up to 400 MHz and entanglement fidelities as high as 0.83.
We demonstrate full integration of vertical optical ring resonators with silicon nanophotonic waveguides on silicon-on-insulator substrates to accomplish a significant step towards 3D photonic integration.
We demonstrate the creation of a light-hole exciton ground state by applying elastic stress to an initially unstrained quantum dot.
The first all-electrically operated wavelength-tunable single-photon source is demonstrated.
A significant step towards integrated vertically rolled-up microcavities is demonstrated by interfacing SiO2 microtube optical ring resonators with tapered fibers.
A novel method for the fabrication of diamond lattice photonic crystals with full band gap by rolling strained pre-patterned titania membranes is proposed.
Dynamic molecular processes of water and ethanol are detected on the surface of rolled-up opto-chemical microtube resonators.
We demonstrate experimentally and theoretically that it is always possible to restore the excitonic degeneracy in quantum dots by the simultaneous application of large strain and electric fields.
We present the first nanomembrane quantum-light-emitting diodes (QLEDs) integrated onto piezoelectric actuators.
The advances we have made in engineering of tubular optical sensors and their on-chip integration allows us to fabricate rolled-up optofluidic ring resonators based on glass material with high quality factors fully integrated on-chip.
E. J. Smith, S. Schulze, S. Kiravittaya, Y. Mei, S. Sanchez, O. G. Schmidt
By guiding the emitted light of quantum dots through atom vapor the speed of the photons is reduced to less than 4% of the speed of light in vacuum.
Optofluidic microcavities from rolled-up ring resonators with subwavelength wall thicknesses are fabricated with excellent sensing function.
Under local illumination, ultrathin silicon nanomembranes on insulator reveal a gate-controlled photovoltaic effect and negative transconductance in Schottky transistors applying both homo- and hetero-contacts.
We have fabricated sub-micrometer light emitting diodes in a mesoscopic semiconductor structure by means of a focused laser beam.
Elastic mechanical strain is a powerful control tool for engineering the electronic states in quantum dots.
An investigation of the material makeup and surrounding medium of an optical rolled-up hyperlens is presented.
We observe giant persistent photoconductivity from rough Si nanomembranes.
Arrays of GaAs microring optical resonators with embedded quantum dots are placed on top of piezoelectric actuators, which allow the microcavities to be reversibly “stretched” or “squeezed” by applying relatively large biaxial stresses at low temperatures.
We have studied quantum dots for which the wetting layer thickness can be arbitrarily controlled.
L. Wang, A. Rastelli, S. Kiravittaya, M. Benyoucef, O. G. Schmidt
The tunability of optical resonant modes of spiral microtube cavities, rolled-up from square patterned SiO/SiO2 thin nanomembranes on glass substrates, is demonstrated experimentally by coating the tube walls by atomic layer deposition.
G. S. Huang, S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding, M. Benyoucef, A. Rastelli1, Y. F. Mei, O. G. Schmidt
In this work, we present steps towards the realization of quantum interference between two photons emitted from two independent QDs.
we demonstrate triggered single-photon emission from a single quantum dot grown on Si substrate for the first time.
We use Si/SiO microtubes as optofluidic components to sense glucose concentrations in water.
A focused laser beam is used both as optical excitation and local heat source to obtain strong coupling in photonic molecules.
The strain state of a wrinkled nanomembrane has been accurately analyzed by incorporating a quantum well into the layer and subsequently using micro-photoluminescence to investigate the shift of the transition energy.
Laser processing is used as a post-growth method to tune, within a broad spectral range and with resolution-limited accuracy, the confined energy states of single quantum dots.
Rolled-up Si/SiO tubes show optically resonant emission in the visible spectral range at room temperature.
We have succeeded in the fabrication of high quality InAs/GaAs quantum dots with degenerate exciton recombination and shown that quantum correlated photon pairs can be produced at temperatures as high as 30 K.
