Costanza Toninelli
University of Florence
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Publication
Featured researches published by Costanza Toninelli.
Optics Express | 2010
Costanza Toninelli; K. Early; J. Bremi; Alois Renn; Stephan Götzinger; Vahid Sandoghdar
We investigate the optical properties of Dibenzoterrylene (DBT) molecules in a spin-coated crystalline film of anthracence. By performing single molecule studies, we show that the dipole moments of the DBT molecules are oriented parallel to the plane of the film. Despite a film thickness of only 20 nm, we observe an exceptional photostability at room temperature and photon count rates around 10(6) per second from a single molecule. These properties together with an emission wavelength around 800 nm make this system attractive for applications in nanophotonics and quantum optics.
Applied Physics Letters | 2010
Costanza Toninelli; Y. Delley; Thilo Stöferle; A. Renn; S. Götzinger; Vahid Sandoghdar
We report on the fabrication and characterization of a scannable Fabry–Perot microcavity, consisting of a curved micromirror at the end of an optical fiber and a planar distributed Bragg reflector. Furthermore, we demonstrate the coupling of single organic molecules embedded in a thin film to well-defined resonator modes. We discuss the choice of cavity parameters that will allow sufficiently high Purcell factors for enhancing the zero-phonon transition between the vibrational ground levels of the electronic excited and ground states.
Physical Review Letters | 2003
G. Ferrari; P. Cancio; Robert E. Drullinger; G. Giusfredi; N. Poli; M. Prevedelli; Costanza Toninelli; G. M. Tino
We report the direct frequency measurement of the visible 5s(2) 1S0-5s5p 3P1 intercombination line of strontium that is considered a possible candidate for a future optical-frequency standard. The frequency of a cavity-stabilized laser is locked to the saturated fluorescence in a thermal Sr atomic beam and is measured with an optical-frequency comb generator referenced to the SI second through a global positioning system signal. The 88Sr transition is measured to be at 434 829 121 311 (10) kHz. We measure also the 88Sr-86Sr isotope shift to be 163 817.4 (0.2) kHz.
Physical Review A | 2011
Pedro García; Riccardo Sapienza; Costanza Toninelli; Cefe López; Diederik S. Wiersma
The work was supported by the EU through Network of Excellence IST-2-511616-NOE (PHOREMOST), and partially supported by EU FP7 NoE Nanophotonics 4 Energy Grant No. 248855; the Spanish MICINN CSD2007-0046 (Nanolight.es), MAT2009-07841 (GLUSFA) and Comunidad de Madrid S2009/MAT-1756(PHAMA) projects. RS acknowledgessupport by RyC.
Applied Physics Letters | 2006
Mher Ghulinyan; Matteo Galli; Costanza Toninelli; Jacopo Bertolotti; Stefano Gottardo; F. Marabelli; Diederik S. Wiersma; L. Pavesi; Lucio Claudio Andreani
Few micron-thick one-dimensional optical superlattices were designed and grown, in which an optimized choice of external dielectric layers allows the formation of a wide and high transmission miniband of coupled cavity states. In such structures a reduction in light group velocity and minimal line shape distortion of propagating optical signal was observed. Group velocity reduction by a factor of 5, obtained both from phase (white-light interferometry) and from time-resolved measurements, is in reasonably good agreement with those calculated through a transfer matrix approach. Time-resolved experiments confirm the minimal line shape distortion for optical pulses of 1.8THz bandwidth at λ=1.5μm wavelength.
Nature Communications | 2016
Antoine Reserbat-Plantey; Kevin G. Schädler; L. Gaudreau; Gabriele Navickaite; Johannes Güttinger; Darrick E. Chang; Costanza Toninelli; Adrian Bachtold
Despite recent progress in nano-optomechanics, active control of optical fields at the nanoscale has not been achieved with an on-chip nano-electromechanical system (NEMS) thus far. Here we present a new type of hybrid system, consisting of an on-chip graphene NEMS suspended a few tens of nanometres above nitrogen-vacancy centres (NVCs), which are stable single-photon emitters embedded in nanodiamonds. Electromechanical control of the photons emitted by the NVC is provided by electrostatic tuning of the graphene NEMS position, which is transduced to a modulation of NVC emission intensity. The optomechanical coupling between the graphene displacement and the NVC emission is based on near-field dipole–dipole interaction. This class of optomechanical coupling increases strongly for smaller distances, making it suitable for nanoscale devices. These achievements hold promise for selective control of emitter arrays on-chip, optical spectroscopy of individual nano-objects, integrated optomechanical information processing and open new avenues towards quantum optomechanics.
New Journal of Physics | 2014
G. Mazzamuto; A. Tabani; Sofia Pazzagli; Sahrish Rizvi; A. Reserbat-Plantey; Kevin G. Schädler; Gabriele Navickaite; L. Gaudreau; F. S. Cataliotti; Costanza Toninelli
In this study we lay the groundwork for a graphene-based fundamental ruler at the nanoscale. It relies on the efficient energy-transfer mechanism between single quantum emitters and low-doped graphene monolayers. Our experiments, conducted with dibenzoterrylene (DBT) molecules, allow going beyond ensemble analysis due to the emitter photo-stability and brightness. A quantitative characterization of the fluorescence decay-rate modification is presented and compared to a simple model, showing agreement with the
Scientific Reports | 2016
Günter Kewes; Max Schoengen; Oliver Neitzke; Pietro Lombardi; Rolf-Simon Schönfeld; Giacomo Mazzamuto; Andreas W. Schell; Jürgen Probst; Janik Wolters; Bernd Löchel; Costanza Toninelli; Oliver Benson
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AIP Advances | 2015
Stefano Lagomarsino; Federico A. Gorelli; Mario Santoro; Nicole Fabbri; Ahmed Hajeb; S. Sciortino; L. Palla; Caroline Czelusniak; M. Massi; F. Taccetti; L. Giuntini; N. Gelli; Dmitry Yu. Fedyanin; F. S. Cataliotti; Costanza Toninelli; Mario Agio
dependence, a genuine manifestation of a dipole interacting with a 2D material. With DBT molecules, we can estimate a potential uncertainty in position measurements as low as 5nm in the range below 30nm.
Light-Science & Applications | 2017
Simona Checcucci; Pietro Lombardi; Sahrish Rizvi; Fabrizio Sgrignuoli; Nico Gruhler; Frederik Dieleman; F. S. Cataliotti; Wolfram H. P. Pernice; Mario Agio; Costanza Toninelli
Tremendous enhancement of light-matter interaction in plasmonic-dielectric hybrid devices allows for non-linearities at the level of single emitters and few photons, such as single photon transistors. However, constructing integrated components for such devices is technologically extremely challenging. We tackle this task by lithographically fabricating an on-chip plasmonic waveguide-structure connected to far-field in- and out-coupling ports via low-loss dielectric waveguides. We precisely describe our lithographic approach and characterize the fabricated integrated chip. We find excellent agreement with rigorous numerical simulations. Based on these findings we perform a numerical optimization and calculate concrete numbers for a plasmonic single-photon transistor.