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We present the use of a compact femtosecond laser with 300-fs pulse duration and pulse energy on the order of 10s of μJ for the cutting of glass by controlled fracture propagation.
Efficient coupling of nanoemitters to photonic or plasmonic structures requires control of the orientation of the emitting dipoles. Nevertheless control of the dipole orientation remains an experimental challenge. Many experiments rely on the realization of many samples, in order to be able to get one nanostructure coupled to a well aligned dipole. In order to avoid these statistical trials, the knowledge...
Metallic structures open the possibility to optimize the emission of a single emitter for the generation of single photons. High collection efficiency can be achieved and the radiative decay rate can be increased through the well-known Purcell effect. For emitters operating at room temperature and thus showing a large linewidth, plasmonic structures are specially well-suited since they exhibit a very...
Plasmonic nano-antennas provide broadband spontaneous emission control by confining light on highly sub-wavelength volumes. This property assures efficient coupling and spectral matching of spectrally broad emitters like defects in diamonds or colloidal quantum dots with nanostructures. Precise positioning of emitters inside the nanostructures has been a limitation for efficient coupling and remains...
It is well-known that, at the single molecule level, the fluorescence emission of semi-conductor nanocrystals (NCs) fluctuate in intensity. For regular NCs, these fluctuations are between “on and off” states, due to the existence of a complete dark state. This corresponds to the blinking phenomenon. This blinking has been associated to the very efficient Auger recombination processes. Recently, CdSe/CdS...
In the field of quantum optics, the control of the radiative properties of single emitter through its coupling to a photonic structure has attracted great attention. In particular, optical cavities enable to reduce the radiative lifetime through the effect first discribed by Purcell. The Purcell factor, which is equal to the increase of the radiative decay rate, is proportional to the cavity quality...
The blinking of fluorophore, that means the switch between bright and dark states, is a well-known phenomenon for single emitters. In the case of standard CdSe/ZnS colloidal quantum dots (QDs), this was considered as their main drawback for experiments at the single molecule level. Statistical analysis of these intensity fluctuations has demonstrated that the dark states duration exhibits a universal...
Enhancing and extracting light emission from a fluorescent system is a challenging problem, with applications ranging from light-emitting diodes to quantum optics. In particular, efficient single photon sources with enhanced decay rate and well-defined emission direction and polarization are of great interest for quantum cryptography devices. Coupling the emitter to the plasmon mode of a metallic...
We have performed polarization spectroscopy on the 5s21S0 →5s5p1P1 transition of atomic strontium. The signal is generated by saturation effects, rather than optical pumping, as the ground state is non-degenerate. This technique generated a dispersion-type lineshape suitable for laser stabilization, without the need for frequency modulation. The dependence of the amplitude and gradient on intensity...
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