A homogeneous linewidth of $85.6\ifmmode\pm\else\textpm\fi{}4.4\text{ }\text{ }\mathrm{kHz}$ is reported in 60 nm ${\mathrm{Eu}}^{3+}$ doped ${\mathrm{Y}}_{2}{\mathrm{O}}_{3}$ nanocrystals at 1.3 K. This linewidth was measured by two-pulse photon echoes on highly scattering powders using heterodyne detection. Spectral diffusion was also investigated by three-pulse photon echoes and resulted in a limited broadening of the homogenous linewidth of about 250 kHz over $120\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. Compared to achievable Rabi frequencies, in the range of several MHz, these values show that rare earth doped nanocrystals can be useful for applications in optical quantum information processing.A homogeneous linewidth of $85.6\ifmmode\pm\else\textpm\fi{}4.4\text{ }\text{ }\mathrm{kHz}$ is reported in 60 nm ${\mathrm{Eu}}^{3+}$ doped ${\mathrm{Y}}_{2}{\mathrm{O}}_{3}$ nanocrystals at 1.3 K. This linewidth was measured by two-pulse photon echoes on highly scattering powders using heterodyne detection. Spectral diffusion was also investigated by three-pulse photon echoes and resulted in a limited broadening of the homogenous linewidth of about 250 kHz over $120\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. Compared to achievable Rabi frequencies, in the range of several MHz, these values show that rare earth doped nanocrystals can be useful for applications in optical quantum information processing.

Physical Review LettersNov 12, 201354 citations

Resonance modes in rare earth doped microcrystals

Katleen Korthout, Koen Van den Eeckhout, Philippe Frederic Smet +1 more

Jan 1, 20100 citations

Development of rare-earth doped nanocrystals for ultra-low power, ultra-high capacity super-resolution optical data storage (Conference Presentation)

Simone Lamon, Qiming Zhang, Y. H. Wu +2 more

The explosive growth of information worldwide emerges as a great challenge for the currently-available big data center platform and compels the development of novel methods and storage devices. Far-field super-resolution techniques have shown the potential to achieve nanoscale three-dimensional optical data storage resulting in a single-disc capacity towards petabytes. In particular, super-resolution photoinduction-inhibited nanolithography (SPIN) has been used to write features with size of 9 nm, while stimulated emission depletion (STED) microscopy is suitable for super-resolution optical data reading. However, the combination of SPIN and STED microscopy for super-resolution optical data storage is presently limited by the high intensity required for the inhibition beam, which results in high energy consumption and damage of the data bits, and the lack of an optically-activatable material for data read-out after SPIN. Recently, rare-earth doped nanocrystals, featuring long luminescence lifetime and emission bands ranging from ultraviolet to near-infrared, have been proven adapt for low-power super-resolution optical data reading through STED microscopy and may be implemented for super-resolution data writing fully based on optical methods. Here, we report about the development of rare-earth doped nanocrystals for ultra-low power, ultra-high capacity super-resolution optical data storage. Core-shell nanoparticles were prepared via co-precipitation and measurements of emission intensity and fluorescence lifetime have been performed. Subsequently, rare-earth doped nanocrystals have been used for optical data storage under 980-nm laser excitation and the data bits were successfully retrieved back by STED microscopy. Finally, simulation results indicate the feasibility of nano-sized recordings and thus a boost of storage capacity is expected.The explosive growth of information worldwide emerges as a great challenge for the currently-available big data center platform and compels the development of novel methods and storage devices. Far-field super-resolution techniques have shown the potential to achieve nanoscale three-dimensional optical data storage resulting in a single-disc capacity towards petabytes. In particular, super-resolution photoinduction-inhibited nanolithography (SPIN) has been used to write features with size of 9 nm, while stimulated emission depletion (STED) microscopy is suitable for super-resolution optical data reading. However, the combination of SPIN and STED microscopy for super-resolution optical data storage is presently limited by the high intensity required for the inhibition beam, which results in high energy consumption and damage of the data bits, and the lack of an optically-activatable material for data read-out after SPIN. Recently, rare-earth doped nanocrystals, featuring long luminescence lifetime and emission bands ranging from ultraviolet to near-infrared, have been proven adapt for low-power super-resolution optical data reading through STED microscopy and may be implemented for super-resolution data writing fully based on optical methods. Here, we report about the development of rare-earth doped nanocrystals for ultra-low power, ultra-high capacity super-resolution optical data storage. Core-shell nanoparticles were prepared via co-precipitation and measurements of emission intensity and fluorescence lifetime have been performed. Subsequently, rare-earth doped nanocrystals have been used for optical data storage under 980-nm laser excitation and the data bits were successfully retrieved back by STED microscopy. Finally, simulation results indicate the feasibility of nano-sized recordings and thus a boost of storage capacity is expected.

Sep 18, 20180 citations

Laser cooling of optically trapped nanocrystals

Galina A. Nemova

Laser cooling and trapping of Yb3+:YAG nano-crystals has been theoretically investigated. It has been shown that in the system of Yb3+:YAG nano-crystals pumped at 1030 nm in the long wavelength tail of the Yb3+ absorption spectrum both internal and translational laser cooling processes take place. The internal laser cooling process based on anti-Stokes fluorescence serves as a supplementary process to translational cooling of rare-earth (RE) doped nano-crystals. The internal laser cooling process can help to reach lower equilibrium translational temperatures of RE-doped nano-crystals.Laser cooling and trapping of Yb3+:YAG nano-crystals has been theoretically investigated. It has been shown that in the system of Yb3+:YAG nano-crystals pumped at 1030 nm in the long wavelength tail of the Yb3+ absorption spectrum both internal and translational laser cooling processes take place. The internal laser cooling process based on anti-Stokes fluorescence serves as a supplementary process to translational cooling of rare-earth (RE) doped nano-crystals. The internal laser cooling process can help to reach lower equilibrium translational temperatures of RE-doped nano-crystals.

Photonic Heat Engines: Science and ApplicationsMar 1, 20190 citations

A homogeneous linewidth of $85.6\ifmmode\pm\else\textpm\fi{}4.4\text{ }\text{ }\mathrm{kHz}$ is reported in 60 nm

{\mathrm{Eu}}^{3+}

doped

{\mathrm{Y}}_{2}{\mathrm{O}}_{3}

nanocrystals at 1.3 K. This linewidth was measured by two-pulse photon echoes on highly scattering powders using heterodyne detection. Spectral diffusion was also investigated by three-pulse photon echoes and resulted in a limited broadening of the homogenous linewidth of about 250 kHz over $120\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. Compared to achievable Rabi frequencies, in the range of several MHz, these values show that rare earth doped nanocrystals can be useful for applications in optical quantum information processing.