Posted on 8/2/2021
Latest article published and entitled: 'Single germanium vacancy centers in nanodiamonds with bulk-like spectral stability.' by M. Nahra, D. Alshamaa, R. Deturche, V. Davydov, L. Kulikova, V. Agafonov, and C. Couteau in AVS Quantum Science 3, 012001 (2021).
Here is the abstract :
Motivated by the success of group IV color centers in nanodiamonds (NDs) for hybrid technology requiring a single photon source, the authors study single germanium-vacancy (GeV−) centers in NDs at room temperature with size ranging from 10 to 50 nm and with remarkable spectral properties. The authors characterize their zero-phonon line, study their internal population dynamics, and compare their emission properties in the framework of a three level model with intensity dependent de-shelving. Furthermore, the authors characterize their lifetime, polarization, and brightness. The authors find a maximum photon emission count rate of 1.6 MHz at saturation. The authors also report a polarization visibility of 92% from the fluorescence light, which potentially makes GeV− centers good candidates for quantum key distribution requiring polarized single photons. The authors show that GeV− centers in NDs presented in this work have a comparable spectral stability compared to their bulk counterpart, which is needed for future applications using nanodiamonds.
Posted on 02/07/2021
qnD is definitely back online again!
Posted on 15/12/2020
Congratulations to Dr Xiaolun XU who successfully passed his PhD defence on “Integrated nanoemitters on glass-based waveguides by photopolymerization”. This was held at the UTT on the 15th of December 2020 and the jury was composed of :
Xiaolun is now looking for a post-doc position.
Posted on 05/07/2018
Congratulations to Dr Jean-Philippe Girard who successfully passed his PhD defence on "Réalisation et caractérisation de photodétecteurs à base de nanofils de semiconducteur". This was held at the UTT on the 05th of July 2018 and the jury was composed of :
Jean-Philippe will start a post-doc position from September onwards at the University of Aalto in Finland
Posted on 5/11/2017
Congratulations to Nancy Rahbany who obtained the Champagne-Ardenne PhD award. She passed her PhD in 2016 under the supervision of CC and Renaud Bachelot working on 'Towards integrated optics at the nanoscale: plasmon-emitter coupling using plasmonic structures'. She is now doing a post-doc at the Langevin Institute at the ESPCI in Paris.
Posted on 5/5/2017
Just passed my research habilitation (HdR) at the Université Pierre and Marie Curie, Sorbonne Université with the title 'Harnessing light-matter interaction: applications in nanophotonics and quantum technologies' with the jury composed of Jean-Michel Raimond (UPMC, ENS), Elisabeth Giacobino (CNRS, ENS), Carlo Sirtori (Paris Diderot), Rémi Carminati (ESPCI), John Rarity (University of Bristol) and Sébastien Tanzilli (CNRS and Université de Nice).
Posted on 5/2/2017
We are part of a European Innovative Training Network (ITN) that has been accepted on Light-Matter Interface for Enabling Quantum Technologies (LIMQUET) with the University of Bourgogne (project coordinator), the University of Oxford, Darmstad University, EPFL Lausanne, the University of Sussex, the University of Sofia and the companies TeemPhotonics, Qubig and Qutools.
Posted on 4/18/2017
This is the first announcement for the Second Topical Meeting on Single Photons Single Spins (SPSS II), to be held in Troyes, France on August 29th to September 1st 2017. Save the date!
The goal of this meeting is to bring together academic and industrial European actors in the fields of
Confirmed keynote speakers
Please find more information at http://www.cost-nqo.eu/event/spss2017/
Abstract submission deadline : May 27th
Registration deadline : July 29th
The meeting is organized by the COST Action on 'Nanoscale Quantum Optics' MP1403 and more specifically jointly by the Working Group 1 and Working Group 3 (see more information here http://www.cost-nqo.eu/). We thank the support from the CNRS GdR IQFA on Quantum Engineering (see more information here http://gdriqfa.unice.fr)
The organizing committee
Information : firstname.lastname@example.org
Posted on 3/6/2017
Latest article published and entitled: 'Plasmon–emitter interaction using integrated ring grating–nanoantenna structures.' by N. Rahbany, W. Geng, R. Bachelot, & C. Couteau in Nanotechnology 28, 185201 (2017).
Here is the abstract :
Overcoming the diffraction limit to achieve high optical resolution is one of the main challenges in the fields of plasmonics, nanooptics and nanophotonics. In this work, we introduce novel plasmonic structures consisting of nanoantennas (nanoprisms, single bowtie nanoantennas and double bowtie nanoantennas) integrated in the center of ring diffraction gratings. Propagating surface plasmon polaritons (SPPs) are generated by the ring grating and coupled with localized surface plasmons (LSPs) at the nanoantennas exciting emitters placed in their gap. SPPs are widely used for optical waveguiding but provide low resolution due to their weak spatial confinement. In contrast, LSPs provide excellent sub-wavelength confinement but induce large losses. The phenomenon of SPP–LSP coupling witnessed in our structures allows for achieving more precise focusing at the nanoscale, causing an increase in the fluorescence emission of the emitters. Finite-difference time-domain simulations as well as experimental fabrication and optical characterization results are presented to study plasmon–emitter coupling between an ensemble of dye molecules and our integrated plasmonic structures. A comparison is given to highlight the importance of each structure on the photoluminescence and radiative decay enhancement of the molecules.
Posted on 2/2/2017
Grest news for the UTT and the LNIO, the international conference on Near-Field Optics NFO15 will be held at the UTT in Troyes from the 26th to the 30th August 2018.
Posted on 1/15/2017
Latest article published and entitled: 'Integrated optical waveguides in glass for enhanced photoluminescence of nano-emitters.'by J. B. Madrigal, R. Tellez-Limon, F. Gardillou, D. Barbier, W. Geng, C. Couteau, R. Salas-Montiel, & S. Blaize in Applied Optics 55, 10263 (2016).
Here is the abstract :
Integrated optical devices able to control light–matter interactions on the nanoscale have attracted the attention of the scientific community in recent years. However, most of these devices are based on silicon waveguides, limiting their use for telecommunication wavelengths. In this contribution, we propose an integrated device that operates with light in the visible spectrum. The proposed device is a hybrid structure consisting of a high-refractive-index layer placed on top of an ion-exchanged glass waveguide. We demonstrate that this hybrid structure serves as an efficient light coupler for the excitation of nanoemitters. The numerical and experimental results show that the device can enhance the electromagnetic field confinement up to 11 times, allowing a higher photoluminescence signal from nanocrystals placed on its surface. The designed device opens new perspectives in the generation of new optical devices suitable for quantum information or for optical sensing.
Posted on 1/4/2017
Just received a cryostat from Attocube for low temperature photoluminescence of nanostructures. Comes with a magnetic field that can go up to 9 T. Nice toy.
Posted on 8/12/2016
Latest article published and entitled: 'Mode-selective quantization and multimodal effective models for spherically layered systems.' authored by D. Dzsotjan, B. Rousseaux, H. R. Jauslin, G. Colas des Francs, C. Couteau, S. Guérin (Phys. Rev. A 94, 023818 (2016).)
Here is the abstract :
We propose a geometry-specific, mode-selective quantization scheme in coupled field-emitter systems which makes it easy to include material and geometrical properties, and intrinsic losses, as well as the positions of an arbitrary number of quantum emitters. The method is presented through the example of a spherically symmetric, nonmagnetic, arbitrarily layered system. We follow it up by a framework to project the system on simpler, effective cavity QED models. Maintaining a well-defined connection to the original quantization, we derive the emerging effective quantities from the full, mode-selective model in a mathematically consistent way. We discuss the uses and limitations of these effective models.
Posted on 7/12/2016
Poster given at the EMP16 - International Conference on Energy, Materials and PhotonicsGdR Ondes Workshop on "Nonlinear and quantum plasmonics" by J. Ph. Girard. The title was 'Nanowire-based Photodetector with High Gain', 10-13 July 2016 in Troyes.
To know more and see the poster, click here.
Posted on 6/29/2016
Congratulations to Aurélie Broussier (graduated from the UTT) who will join us as PhD student in September (co-supervision with R. Bachelot) and to Stefano Pierini (graduated from U. Florence) who will also start a PhD with us from October onwards (co-supervision with A. Bramati).
Posted on 6/14/2016
Invited talk given at the conference "Quantum simulations and many-body physics with light" by C. Couteau. The title was 'Coupling metamaterials and plasmons with quantum states of light', 4-10 June 2016 in Chania, Crete. This was an event co-opted by the COST Action NQO.
Posted on 6/1/2016
Invited talk given at the GdR Ondes Workshop on "Nonlinear and quantum plasmonics" by C. Couteau. The title was 'Coupling metamaterials with quantum states of light', 1st June 2016.
No thanks to French SNCF strkies, I did manage to get there...
Posted on 4/3/2016
Congratulations to Dr Nancy Rahbany who successfully passed her PhD defence on "Towards Integrated Optics at the Nanoscale: Plasmon-emitter Coupling Using Plasmonic Structures". This was held at the UTT on Friday the 25th of March 2016 and the jury was composed of :
Nancy will start a post-doc position from September onwards at the ESPCI in Paris.
Posted on 3/1/2016
Our work entitled 'On the addressing of quantum emitters using nanophotonics' was presented at SPIE Photonics West, 13-18 February 2016 in San Francisco. Great conference (so many industry booths, it was like a toy store) and a great location.
Posted on 12/15/2015
Our paper "Efficient addressing of a single photon source by a nanowaveguide" has been accepted for publication in Scientific Report. To be published in 2016.
Merry Christmas !
Posted on 9/30/2015
Nancy Rahbany has been working for few weeks at the University of Cambridge in Prof Mete Atature’s group as well as the University of Saarland in Prof Christoph Becher’s group. She has been working on SiV centers in diamond. Exciting! This collaboration was sponsored by the COST Action Nanoscale Quantum Optics. If you want to know more about COST Action Nanoscale Quantum Optics, go and visit the wesbite here.
Posted on 6/29/2015
On the 29th of June 2015, Mr Wei Geng passed his PhD defence with success at the University of Technology of Troyes. His PhD title was: ‘Coupling Nanostructures Towards Integrated Nanophotonics Devices’ and the jury was composed of the following members: A. BRAMATI, C. BECHER, C. COUTEAU, B. GAYRAL, J.-F. ROCH, L. GIRAUDET and V. SALLET. Wei now works at Huawei in quantum information technologies.
Posted on 4/30/2015
On the 20th of April 2015 last week, we moved our labs from the F and G buildings to the X building. The newly-made X building will have all the LNIO research, containing the nanofabrication and charactersation Nanomat Platform and more... Here are some pictures :
Posted on 3/16/2015
We have a contributed talk accepted to the SPIE conference on Optics and Optoelectronics in Prague :
N. Rahbany, W. Geng, R. Salas-Montiel, S. Blaize, R. Bachelot, C. Couteau. "Efficient plasmon-emitter coupling via integrated ring grating-nanoantenna structures". SPIE Optics and Optoelectronics, Prague, Czech Republic, 13-16 April 2015, contributed talk.
Posted on 3/16/2015
Very interesting conference on near-field interaction in general. We had a contributed talk there.
N. Rahbany, W. Geng, R. Salas-Montiel, S. Blaize, R. Bachelot, C. Couteau. "Efficient plasmon-emitter coupling via integrated ring grating-nanoantenna structures". Forum des microscopies à sonde locale, Troyes, France, 16-20 March 2015, contributed talk.
To know more : http://www.sondeslocales.fr/accueil
Posted on 3/10/2015
Our paper "Coherent Perfect Absorption in the Single Photon Regime" has been accepted for publication in Nature Communications. This is a great step towards coupling quantum optics with metamaterials. You can find it here.
Posted on 9/17/2014
Condensed Matter Days if organised by the French Society of Physics and is one of the biggest conference of physicists in France. We presented a poster and a talk :
N. Rahbany, W. Geng, R. Salas-Montiel, S. Blaize, R. Bachelot, C. Couteau. "Study of plasmonic rings for efficient excitation of surface plasmon-polaritons". Journées de la Matière Condensée 2014 (JMC14) Condensed Matter, Paris, France, 24-29 August 2014, contributed talk.
W. Geng, M. Manceau, N. Rahbany, V. Sallet, A. Bramati, C. Couteau, “Exciting single CdSe/CdS nanocrystals by single nanowires waveguides”, Journées de la Matière Condensée 2014 (JMC14) Condensed Matter, Paris, France, 24-29 August 2014, poster session.
Posted on 6/11/2014
We presented one poster and one presentation at META 14, 5th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Nanyang Technological University (NTU) in Singapore.
Posted on 5/10/2014
We presented some of our results at the COST Action 'Nanospectrocopy' conference in Tübingen:
N. Rahbany, W. Geng, S. Blaize, R. Bachelot, C. Couteau. "Towards strong coupling at the nanoscale: study of plasmonic rings for efficient excitation of SPPs". Optical Nanospectroscopy I Conference, Tubingen, Germany, 24-28 March 2014. Poster session.
2017 CLEO Pacific Rim Conference
31 July-04 August 2017
Single Photons Single Spins II
(SPSSII) Meeting, University of Technology of Troyes,
29 August-01 September 2017.
15th International Conference on Near-Field Optics, Nanophotonics and related techniques (NFO15),
University of Technology of Troyes,
26-30 August 2018.
COST Nanoscale Quantum Optics (NQO)