ORGANIC MOLECULES in photonics

Transcription

1 ORGANIC MOLECULES in photonics Progress in Photonics, Florence probe surface scattered waves Costanza Toninelli nanophotonics

2 Single Molecules: From Sensing To Quantum Optics Single molecule in the solid state Electron- phonon Cryogenic T coupling 1 1 ps Optical transition 50% ZPL narrow line 0 ps 0 T i f = Quantum ICTs Fermi s golden rule 2 2π f d E ( r ) i ( r ) ω ρ ω Transition dipole moment Local DOS Radiative and non Sense LDOS by lifetime measurements or frequency shift Sense on nanoscale Quantum sensors Single photon source Coherenceà nln. element Coupling to photonics J. Hwang, et al., Nature 460, 76 (2009)

3 Dibenzoterrylene (DBT) in Anthracene DBT / Anthracene Anthracene crystal Stable at room temperature Thin films (~50 nm) 5 µm Orient on the plane ZPL at 785 nm C. Toninelli et al., Opt. Express 18, 6577 (2010)

4 DBT Optical Properties Second order correlation Brightness 98% suppression Single Photon Source 1 MHz Bright C. Toninelli et al., Opt. Express 18, 6577 (2010)

5 DBT at Cryo Temperatures Exciation spectrum Scanning laser frequency over 2 GHz at 3.5 K Lifetime-limited linewidth 40 MHz Narrow molecules Inhomogeneously broadened (0.1 nm) ü Single Photon Source ü No dephasing/ Coherence ü Tunability by Stark shift ü Coupling

6 Nano-Positioning Fluorescence AFM manipulation (Berlin) Kewes et al., arxiv.: (2015) Intensity autocorrelation

7 Sense/communicate at the n-scale Coupled to optical antennas for enhanced collection Collaboration with M. Agio Coupled to Hybrid WG for SPS and coop. effects Collaboration with O. Benson, W. Pernice, S. Meier groups Coupled to graphene to sense position Collaboration with F. Koppens group A nice competitor for DBT SiV centers Collaboration with S. Lagomarsino

8 Dielectric Waveguides: Towards integrated SPS Rate = (1/4)*(σ/A)*(1/n^2) σ = 3λ^2/2π A = effective Area depending on emitter position Hwang and Hinds., New Journal of Physics, 13, (2011)

9 Dielectric Waveguides: Towards integrated SPS Dense sample à Fluorescence is coupled into the WG Pump light SEM White light image Output coupler Fluorescence Small crystal Kewes et al., arxiv.: (2015)

10 Dielectric Waveguides: Towards integrated SPS Fluorescence spectra Fluorescence Pump

11 Plasmonic Wedge-Waveguides: Towards Cooperative effects Big highly- doped molecular crystal Theoretical model: What to look at, what to expect? Fluorescence scan Au is everywhere Dark waveguide à light is coupled to SP Cooperative effects?

12 Sense/communicate at the n-scale Coupled to optical antennas for enhanced collection Collaboration with M. Agio Coupled to Hybrid WG for SPS and coop. effects Collaboration with O. Benson, W. Pernice, S. Meier groups Coupled to graphene to sense position Collaboration with F. Koppens group A nice competitor for DBT SiV centers Collaboration with S. Lagomarsino

13 FRET from DBT to graphene E >1.3E F Plasmons are strongly damped 1 or 2 (orientation) fine structure constant Γ g Γ ref =1+ 9να " λ $ 0 256π 3 ( ε sub +ε ) 2 ref # d % ' & 4 distance from graphene Universal scaling law Long interaction length Graphene-based Nanoruler Measure lifetime vs distance statistical analysis Get a good reference

14 DBT-energy transfer to Graphene Lifetime reduction is associated to quenching N(t) = QY ρ ee (t)γ rad Mazzamuto et al., New J. Phys. 16 (2014)

15 Proof of principle for G-ruler Guess from model Exper. values Good agreement btw model and data Estimators η =1 Γ ref Γ g η Max (61± 20)% Proof for Graphene-based Nanoruler Mazzamuto et al., New J. Phys. 16 (2014)

16 In progress: Casimir force-ruler Modified Vacuum potential Distance- dependent Level shift C. A. Muschik, et alt. Phys. Rev. Lett. 112, (2014)

17 Sense/communicate at the n-scale Coupled to optical antennas for enhanced collection Collaboration with M. Agio Coupled to Hybrid WG for SPS and coop. effects Collaboration with O. Benson, W. Pernice, S. Meier groups Coupled to graphene to sense position Collaboration with F. Koppens group A nice competitor for DBT SiV centers Collaboration with S. Lagomarsino

18 SiV centers in diamond D3d geometry HOME- MADE implanted SiV (collaboration with CNR- Firenze) Mono- crystalline diamonds Implantation depth: 2um (impl. Energy Mev) Inversion symmetric potential: - narrow room temp. (1 nm) - 70% brunching ratio for ZPL - no charge dynamic spectral diffusion - weak coupling with host matrix - low inhomogeneous broadening (1 GHz) Around 5 nm ensamble RT Single SiV centers both in ndiamonds and in bulk 150MHz cryo temp. A. Sipahigil et al., PRL 113, (2014) 632 nm

19 LAB ALBUM 2014/2015 Collaborators: F.S. Cataliotti D.S. Wiersma M. Gurioli F. Koppens O. Benson W. Pernice S. Meier Post-Doc F. Sgrignuoli P.E. Lombardi PhD students G. Mazzamuto S. Rizvi S. Pazzagli S. Checcucci

20 THANK YOU FOR YOUR ATTENTION SM- graphene nanoposition sensor WG- Integrated SPS SP- mediated coop. effects planar antennas On- demand source of single indistinguishable photons Implanted SiV Costanza Toninelli nanophotonics