an array of rolled up nanomembranes


Nano- and quantum photonics

31 Jul 2018

Brightest source of entangled photons

New broadband optical antenna for highly efficient extraction of entangled photons with a yield of 37% per pulse.

Nature Commun. 9, 2994 (2018)

Press Release

9 Apr 2018

Manipulating photon−plasmon coupling in microtube cavities

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.

ACS Nano 12, 3726 (2018)

	A material that collectively emits entangled photons on demand

26 May 2017

A material that collectively emits entangled photons on demand

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.

 

Nature Commun. 8, 15501 (2017)

24 Jan 2017

Monolithically integrated microtube cavities for optofluidic sensing

Monolithically integrated vertical ring resonators pave the way for optofluidics in three-dimensions on photonic chips.

Opt. Lett. 42, 486 (2017)

30 Aug 2016

Piezo-controlled silicon integrated quantum dot photonics

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 .

Nano Lett. 16, 5785 (2016)

23 Jun 2016

Plasmon-photon coupling in tubular microcavities

Selective coupling of localized surface plasmons and resonant optical modes is achieved in cleverly patterned microtubular optical cavities. 

Phys. Rev. Lett. 116, 253904 (2016)

18 Mar 2016

Spin-orbit coupling of light in asymmetric microcavities

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.

Nature Comm. 7, 10983 (2016)

27 Jan 2016

Scalable entangled photon sources for the long haul

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.

Nature Commun. 7, 10387 (2016)

	The fastest entangled photon sources come from IIN

The fastest entangled photon source

We demonstrate strain-tunable entangled-light-emitting-diodes operating at frequencies up to 400 MHz and entanglement fidelities as high as 0.83.

Nature Comm. 6, 10067 (2015)

	Monolithic integration of vertical optical ring resonators

Monolithic integration of vertical optical ring resonators

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.

Opt. Lett. 40, 3826 (2015)

	Stretching quantum dots till they become light

Stretching quantum dots till they become light

We demonstrate the creation of a light-hole exciton ground state by applying elastic stress to an initially unstrained quantum dot. 

Nat. Phys. 10, 46 (2014)

	A wavelength-tunable single-photon emitting diode

A wavelength-tunable single-photon emitting diode

The first all-electrically operated wavelength-tunable single-photon source is demonstrated.

Nano Lett. 13, 5808 (2013)

	Vertical add-drop filter made from a rolled-up ring resonator

Vertical add-drop filter made from a rolled-up ring resonator

A significant step towards integrated vertically rolled-up microcavities is demonstrated by interfacing SiO2 microtube optical ring resonators with tapered fibers. 

Appl. Phys. Lett. 102, 251119 (2013)

	Diamond lattice photonic crystals from rolled-up membranes

Diamond lattice photonic crystals from rolled-up membranes

A novel method for the fabrication of diamond lattice photonic crystals with full band gap by rolling strained pre-patterned titania membranes is proposed.

Phys. Rev. A. 87, 041803 (2013)

	Dynamic molecular processes detected by nanomembrane based microtube cavities

Dynamic molecular processes detected by nanomembrane based microtube cavities

Dynamic molecular processes of water and ethanol are detected on the surface of rolled-up opto-chemical microtube resonators.

Adv. Mater. 25, 2357 (2013)

	Making quantum dots electronically symmetric

Making quantum dots electronically symmetric

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.

Phys. Rev. Lett. 109, 147401 (2012)

	Engineering the properties of Quantum-Light-Emitting Diodes by strain

Engineering the properties of quantum-light-emitting diodes by strain

We present the first nanomembrane quantum-light-emitting diodes (QLEDs) integrated onto piezoelectric actuators. 

Adv. Mater. 24, 2668–2672 (2012)

	On-chip integration of rolled-up ring resonators as label-free optofluidic sensors

On-chip integration of rolled-up ring resonators as label-free optofluidic sensors

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. 

Lab Chip 12, 2649 (2012)

	Lab-in-a-tube

Lab-in-a-tube for single cell optofluidic detection

E. J. Smith, S. Schulze, S. Kiravittaya, Y. Mei, S. Sanchez, O. G. Schmidt

Nano Lett. 11, 4037 (2011)

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	Slowing down single photons from quantum dots

Slowing down single photons from quantum dots

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.

Nat. Photonics 5, 230 (2011)

	Tubular optofluidic sensors for enhanced refractive index sensing

Tubular optofluidic sensors for enhanced refractive index sensing

Optofluidic microcavities from rolled-up ring resonators with subwavelength wall thicknesses are fabricated with excellent sensing function.

ACS Nano 4, 3123 (2010)

	Photovoltaic effect in ultrathin Si nanomembranes

Photovoltaic effect in ultrathin Si nanomembranes

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.

Adv. Mater. 22, 3667 (2010)

	Direct laser writing of nanoscale light-emitting diodes

Direct laser writing of nanoscale light-emitting diodes

We have fabricated sub-micrometer light emitting diodes in a mesoscopic semiconductor structure by means of a focused laser beam.

Adv. Mater. 22, 3176 (2010)

	Electromechanical tuning of quantum dot emission energies

Electromechanical tuning of quantum dot emission energies

Elastic mechanical strain is a powerful control tool for engineering the electronic states in quantum dots.

Phys. Rev. Lett. 104, 067405 (2010)

	Metamaterial fiber optics

Metamaterial fiber optics

E. J. Smith, Z. Liu, Y. Mei, O. G. Schmidt

Nano Lett. 10, 1, 1-5 (2010)

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	Rolled-up hyperlens

Rolled-up hyperlens

An investigation of the material makeup and surrounding medium of an optical rolled-up hyperlens is presented.

Applied Physics Letters 95, 083104 (2009)

Applied Physics Letters 96, 019902 (2010)

	Giant persistent photoconductivity in Si nanomembranes

Giant persistent photoconductivity in Si nanomembranes

We observe giant persistent photoconductivity from rough Si nanomembranes.

Nano Lett. 9, 3453 (2009)

	Epitaxial quantum dots in stretchable optical microcavities

Epitaxial quantum dots in stretchable optical microcavities

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. 

Opt. Express 17, 22452 (2009)

	Tuneable electronic shell structure of GaAs quantum dots

Tuneable electronic shell structure of GaAs quantum dots

We have studied quantum dots for which the wetting layer thickness can be arbitrarily controlled.

Phys. Rev. B 80, 085309 (2009)

	Self-assembled quantum dot molecules

Self-assembled quantum dot molecules

L. Wang, A. Rastelli, S. Kiravittaya, M. Benyoucef, O. G. Schmidt

Adv. Mater. 21, 2601 (2009)

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	Spectral tunability of microtube resonators on glass

Spectral tunability of microtube resonators on glass

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. 

Opt. Lett. 34, 2345 (2009)

	Shaped tubular optical microcavities

Microtubular optical cavities

G. S. Huang, S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding, M. Benyoucef, A. Rastelli1, Y. F. Mei, O. G. Schmidt

Appl. Phys. Lett. 94, 141901 (2009)

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	Towards tunable indistinguishable photons from distant quantum dots

Towards tunable indistinguishable photons from distant quantum dots

In this work, we present steps towards the realization of quantum interference between two photons emitted from two independent QDs.

Appl. Phys. Lett. 95, 261908 (2009)

	First single photon source on silicon substrate

First single photon source on silicon substrate

we demonstrate triggered single-photon emission from a single quantum dot grown on Si substrate  for the first time.

Nano Lett. 9, 304–307 (2009)

	Glucose detection on the femtoliter scale

Glucose detection on the femtoliter scale

We use Si/SiO microtubes as optofluidic components to sense glucose concentrations in water. 

Appl. Phys. Lett. 93, 094106 (2008)

	Strongly coupled semiconductor microcavities

Strongly coupled semiconductor microcavities

A focused laser beam is used both as optical excitation and local heat source to obtain strong coupling in photonic molecules. 

Phys. Rev. B 77, 035108 (2008)

	Quantum wells illuminate the strain state of nanomembranes

Quantum wells illuminate the strain state of nanomembranes

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.

Nano Lett. 7, 1676 (2007)

	Perfectly resonant quantum dots

Perfectly resonant quantum dots

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.

Appl. Phys. Lett. 90, 073120 (2007)

	Si/SiO microtube optical ring resonators

Si/SiO microtube optical ring resonators

Rolled-up Si/SiO tubes show optically resonant emission in the visible spectral range at room temperature.

Appl. Phys. Lett. 90, 091905 (2007)

	Entangled photons from single quantum dots

Entangled photons from single quantum dots

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.

New J. Phys. 9, 315 (2007)