Single Emitter Detection with Fluorescence and Extinction Spectroscopy
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1 Single Emitter Detection with Fluorescence and Extinction Spectroscopy Michael Krall Elements of Nanophotonics Associated Seminar Recent Progress in Nanooptics & Photonics May 07, 2009
2 Outline Single molecule fluorescence detection Single molecule extinction measurements Theoretical limits Comparison in terms of SNR Single quantum dot spectroscopy Laser scan image of a single molecule (FWHM focus spot 370 nm). Outlook
3 Single molecule fluorescence detection Single molecule fluorescence studies R.J. Pfab et al., Chem. Phys. Lett. 387, 490 (2004) transition dipole moments of terrylene molecules are oriented approximately perpendicular to substrate p-terphenyl film on a glass substrate with dopant terrylene molecules. Experimental fluorescence microscopy setup.
4 Single molecule fluorescence detection Single molecule fluorescence studies R.J. Pfab et al., Chem. Phys. Lett. 387, 490 (2004) asymmetries attributed to a slight tilt of the emission dipole with respect to optical axis nearly ring-like emission pattern = characteristic of vertically oriented dipoles Fluorescence image.
5 Single molecule extinction measurements Detection of a single emitter in transmission G. Wrigge et al., Nature Phys. 4, 60 (2008) I d I e Energy-level scheme of a molecule. Arrangement of the lenses in the illumination and collection paths.
6 Single molecule extinction measurements Detection of a single emitter in transmission G. Wrigge et al., Nature Phys. 4, 60 (2008) Example of a transmission spectrum (11.5% dip).
7 Single molecule extinction measurements Single-molecule detection with ultrafaint light sources G. Wrigge et al., Nature Phys. 4, 60 (2008) Extinction spectrum recorded from a single molecule under an ultrafaint detected power of 550 photons per second.
8 Theoretical limits Scattering by a classical oscillator Abraham-Lorentz equation: G. Zumofen et al., PRL 101, (2008) q.. displacement of electron Γ.. damping by non-radiative channels ( 0) E 0.. electric field amplitude at place of oscillator ε.. unit vector along direction of driving field E τ.. characteristic time of damping by radiation reaction (see Jackson: Classical Electrodynamics) gives stationary state solution of q: which allows to calculate stationary state scattered far-field: Δ.. laser frequency detuning Γ.. damping rate (Gaussian units)
9 Theoretical limits Scattering by a classical oscillator G. Zumofen et al., PRL 101, (2008) total scattered power: where is the time-averaged electric energy density at O and the total scattering cross section of the oscillator.. cross section at resonance: depends only on wavelength!
10 Theoretical limits Scattering by a two-level system (semi-classical description) stationary state population of the upper state: G. Zumofen et al., PRL 101, (2008) (see Cohen-Tannoudji et al.: Atom-Photon interactions) Γ 1.. radiative decay rate Γ 2.. damping rate of polarization Γ 2*.. dephasing rate for nonradiating processes V.. Rabi frequency d 12.. transition dipole moment gives power scattered into solid angle of 4π:
11 Theoretical limits Light scattering by an oscillating dipole in a focused beam G. Zumofen et al., PRL 101, (2008) ratio of scattered to incident power: effective cross section: classical oscillator two-level system a.. entrance-aperture radius α.. entrance half angle β.. collection half angle f.. focal length effective focal area in the case of a focused plane wave: power transmitted through focal plane electric energy density at focal spot scattered power depends only on field strength at position of oscillator!
12 Theoretical limits Light scattering by an oscillating dipole in a focused beam G. Zumofen et al., PRL 101, (2008) 10% a.. entrance-aperture radius α.. entrance half angle β.. collection half angle f.. focal length Transmittance of a focused plane wave as a function of the angles α and β. focused plane wave can be attenuated up to 90%!
13 Theoretical limits Light scattering by an oscillating dipole in a focused beam G. Zumofen et al., PRL 101, (2008) focused plane wave (α=β=π/3) directional dipolar wave (α=β=π/2) Transmittance as a function of the detuning. a.. entrance-aperture radius α.. entrance half angle β.. collection half angle f.. focal length directional dipolar wave can be completely attenuated!
14 Comparison in terms of SNR Limits of single emitter detection in fluorescence and extinction G. Wrigge et al., Opt. Express 16, (2008) AL.. aspheric lens SIL.. solid immersion lens LP /SP.. long/short pass PD.. photodetector Level scheme of a dye molecule. (λ las 590 nm, λ red > 600 nm) Schematics of the experimental setup. (Sample: DBATT molecules embedded in a n-tetradecane matrix) Power on PD: (without filter) laser molecular emission interference
15 Comparison in terms of SNR Limits of single emitter detection in fluorescence and extinction G. Wrigge et al., Opt. Express 16, (2008) Extinction and fluorescence excitation spectra recorded from a single molecule in transmission at three different detected laser powers.
16 Comparison in terms of SNR Limits of single emitter detection in fluorescence and extinction G. Wrigge et al., Opt. Express 16, (2008) Power on PD: (without filter) resonant: red-shifted: α.. power emitted on 0-0 ZPL to total excited state emission Γ 1.. total spontaneous emission rate Γ 2.. transverse decay rate Saturation parameter: ζ.. collected fraction of total emitted molecular power μ.. account for losses and detector efficiency K.. ratio of scattered to incident power
17 Comparison in terms of SNR SNR for a fluorescence excitation measurement G. Wrigge et al., Opt. Express 16, (2008) noise sources: shot noise of the fluorescence fluctuations in the detectors dark counts SNR for an extinction measurement noise sources: shot noise of the detected signal fluctuations on the laser intensity fluctuations on the detector dark counts total noise shot noise of laser
18 Comparison in terms of SNR SNR for fluorescence excitation vs. extinction measurements G. Wrigge et al., Opt. Express 16, (2008) μ = 0.2 K = 0.5 (strong focusing!) α = 0.2 ζ = 0.02 Γ 2 = Γ 1 /2 Γ 1 /2π = 17 MHz transmission fluorescence Signal-to-noise ratios of the resonant transmission and fluorescence signals as a function of the excitation power and saturation parameter. SNR of extinction measurements wins in the case of stronger excitations up to saturation!
19 Comparison in terms of SNR Limit of extinction measurements G. Wrigge et al., Opt. Express 16, (2008) μ = 1 K = 0.5 (strong focusing!) α = 1 Γ 2 = Γ 1 /2 The SNR for a resonant transmission detection of emitters with different radiative decay rates. single emitters with spontaneous emission times as long as a millisecond detectable using extinction spectroscopy!
20 Single quantum dot spectroscopy Strong extinction of a far-field laser beam by a single quantum dot A.N. Vamivakas et al., Nano Lett. 7, 2892 (2007) Illustration of the experimental apparatus used for both microphotoluminescence and resonant scattering measurements.
21 Single quantum dot spectroscopy Strong extinction of a far-field laser beam by a single quantum dot A.N. Vamivakas et al., Nano Lett. 7, 2892 (2007) Strength of the scattered light signal as a function of incident laser power. Best line scan recorded for the lowest power point. The measured contrast is 12% and the line width is 368 MHz (1.47 μev).
22 Single quantum dot spectroscopy Strong extinction of a far-field laser beam by a single quantum dot A.N. Vamivakas et al., Nano Lett. 7, 2892 (2007) Line scans as a function of incident laser power to demonstrate power broadening of the QD X 0 transition. Saturation curve.
23 Conclusions & Outlook single emitters with spontaneous emission times as long as milliseconds detectable direct access to coherent interaction of incident light and emitter detection of single solid-state quantum emitters at room temperature imaging of small metallic and dielectric nanoparticles possibility for a strong coupling of few photons with a single quantum emitter
24 Thanks for your attention! References: R.J. Pfab et al., Chem. Phys. Lett. 387, 490 (2004) G. Wrigge et al., Nature Phys. 4, 60 (2008) G. Zumofen et al., PRL 101, (2008) G. Wrigge et al., Opt. Express 16, (2008) A.N. Vamivakas et al., Nano Lett. 7, 2892 (2007)
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