Spontaneous emission from crystal centers is influenced by both the photonic local density of states and non-radiative processes. Here, we monitor the spontaneous emission of single nitrogen vacancy (NV) centers as their host diamond is reduced in size from a large monolithic crystal to a nanocrystal by successive cycles of oxidation. The size reduction induces a quenching of the NV radiative emission. Additional non-radiative channels lead to a decrease of the fluorescence intensity and the excited state lifetime. In one case, we observe the onset of blinking which may provide a route to understand these additional non-radiative decay channels.Spontaneous emission from crystal centers is influenced by both the photonic local density of states and non-radiative processes. Here, we monitor the spontaneous emission of single nitrogen vacancy (NV) centers as their host diamond is reduced in size from a large monolithic crystal to a nanocrystal by successive cycles of oxidation. The size reduction induces a quenching of the NV radiative emission. Additional non-radiative channels lead to a decrease of the fluorescence intensity and the excited state lifetime. In one case, we observe the onset of blinking which may provide a route to understand these additional non-radiative decay channels.

arXiv:1305.6405Applied Physics LettersJun 24, 201326 citations

Relaxation of Photon Density in a Resonant Medium

Yu. A. Vdovin

Journal of Experimental and Theoretical PhysicsAug 1, 19660 citations

Measurement of high conversion efficiency to 123.6-nm radiation in a four-wave-mixing scheme enhanced by electromagnetically induced transparency

C. Franklin Dorman, İbrahim Küçükkara, J. P. Marangos

We report measurements of the absolute yield of 123.6-nm vacuum ultraviolet (VUV) radiation produced in a resonant four-wave-mixing scheme in krypton enhanced by electromagnetically induced transparency. One of the mixing fields, in the ultraviolet (UV) at 212.55 nm, was in two-photon resonance with the ${4p}^{6}{}^{1}{S}_{0}--{4p}^{5}5p[0,\frac{1}{2}]$ transition of krypton, while a second field (the coupling field) at 759 nm was resonant with the ${4p}^{5}5p[0,\frac{1}{2}]{\ensuremath{-}4p}^{5}5s[1,\frac{1}{2}]$ transition. Electromagnetically induced transparency has been predicted to be induced by this coupling field and to enhance the efficiency of the generation of the field at 123.6 nm, on the ${4p}^{5}5s[1,\frac{1}{2}]$ to ${4p}^{6}{}^{1}{S}_{0}$ transition. This was confirmed by measurements of the absolute VUV radiation yield using a calibrated photodiode in the limit of a large density-length product. Energies of \ensuremath{\sim}30 nJ were produced, which gave a conversion efficiency, from the coupling field energy of \ensuremath{\sim}1%. Higher yields are thought to be achievable by increasing the coupling laser intensity, the path length of the medium, and by the use of a transform-limited UV pulse of the same duration as the coupling field.We report measurements of the absolute yield of 123.6-nm vacuum ultraviolet (VUV) radiation produced in a resonant four-wave-mixing scheme in krypton enhanced by electromagnetically induced transparency. One of the mixing fields, in the ultraviolet (UV) at 212.55 nm, was in two-photon resonance with the ${4p}^{6}{}^{1}{S}_{0}--{4p}^{5}5p[0,\frac{1}{2}]$ transition of krypton, while a second field (the coupling field) at 759 nm was resonant with the ${4p}^{5}5p[0,\frac{1}{2}]{\ensuremath{-}4p}^{5}5s[1,\frac{1}{2}]$ transition. Electromagnetically induced transparency has been predicted to be induced by this coupling field and to enhance the efficiency of the generation of the field at 123.6 nm, on the ${4p}^{5}5s[1,\frac{1}{2}]$ to ${4p}^{6}{}^{1}{S}_{0}$ transition. This was confirmed by measurements of the absolute VUV radiation yield using a calibrated photodiode in the limit of a large density-length product. Energies of \ensuremath{\sim}30 nJ were produced, which gave a conversion efficiency, from the coupling field energy of \ensuremath{\sim}1%. Higher yields are thought to be achievable by increasing the coupling laser intensity, the path length of the medium, and by the use of a transform-limited UV pulse of the same duration as the coupling field.

Physical Review ADec 8, 199950 citations

Laser Photon Densities

WORLD SCIENTIFIC eBooksJun 12, 20170 citations

Master-equation approach to collisionally induced absorption and emission

G. Alber, J. Cooper

We study the collisionally induced excitation and photon emission of a neutral radiator atom surrounded by a gas of neutral foreign perturbers within the binary-collision approximation. We derive an equation of motion for the reduced density matrix of the radiator and obtain the spectrum of the spontaneously emitted photons including components due to collisionally induced radiation and to Rayleigh scattering, which is valid in both impact and quasistatic regimes. In our formulation single and subsequent collisional contributions are taken into account, and various coherent and incoherent corrections are examined.We study the collisionally induced excitation and photon emission of a neutral radiator atom surrounded by a gas of neutral foreign perturbers within the binary-collision approximation. We derive an equation of motion for the reduced density matrix of the radiator and obtain the spectrum of the spontaneously emitted photons including components due to collisionally induced radiation and to Rayleigh scattering, which is valid in both impact and quasistatic regimes. In our formulation single and subsequent collisional contributions are taken into account, and various coherent and incoherent corrections are examined.

Physical Review AMay 1, 198614 citations

{4p}^{6}{}^{1}{S}_{0}--{4p}^{5}5p[0,\frac{1}{2}]

transition of krypton, while a second field (the coupling field) at 759 nm was resonant with the ${4p}^{5}5p[0,\frac{1}{2}]{\ensuremath{-}4p}^{5}5s[1,\frac{1}{2}]$ transition. Electromagnetically induced transparency has been predicted to be induced by this coupling field and to enhance the efficiency of the generation of the field at 123.6 nm, on the

{4p}^{5}5s[1,\frac{1}{2}]

{4p}^{6}{}^{1}{S}_{0}

transition. This was confirmed by measurements of the absolute VUV radiation yield using a calibrated photodiode in the limit of a large density-length product. Energies of \ensuremath{\sim}30 nJ were produced, which gave a conversion efficiency, from the coupling field energy of \ensuremath{\sim}1%. Higher yields are thought to be achievable by increasing the coupling laser intensity, the path length of the medium, and by the use of a transform-limited UV pulse of the same duration as the coupling field.