28 Mar
2013
28 Mar
'13
2:57 p.m.
***HQOC/ITAMP Joint Quantum Sciences Seminar***
**April 3, 2013 at 4:00 PM - Jefferson 250**
*Prof. Romain Quidant, ICREA Professor, ICFO*
"Shining a (Bright) Light on the Very Small"
Extensive research in Nano-optics over the last decade has made possible controlling
optical fields on the nanometer scale. Such concentration of light, well below the limit
of
diffraction opens plenty of new routes towards enhanced interaction with tiny amounts of
matter down to the single molecule/atom level. In this talk we will present our recent
advances in enhanced light-matter interaction on the nanometer scale and their
applications to quantum optics.
We first discuss the controlled electromagnetic coupling of single to few quantum emitters
with plasmonic nano-antennas. For this purpose, we developed a fabrication technique
that enables accurate positioning of said quantum dot(s) at a predefined location of the
antenna. Our experiments first shows that the antenna can be designed to efficiently
control the emission properties of the quantum emitters. Using the same technique, we also
demonstrate that a single qdot can be used to probe the optical near field of the
antenna.
In the second part of the talk we discuss a different approach in which light is used to
trap and manipulate a single nanodiamond containing a single nitrogen vacancy. We
demonstrate both translational and angular control of the trapped NV and discuss
applications to vectorial magnetometry and mapping of the electromagnetic local density
of states.
The final part of the talk presents our recent advances in optomechanics. We optically
trap a single nanoparticle in high vacuum and cool its three spatial degrees of freedom
by
means of active parametric feedback. Using a single laser beam for both trapping and
cooling we demonstrate a temperature compression ratio of four orders of magnitude. The
absence of a clamping mechanism provides robust decoupling from the heat bath and
eliminates the requirement of cryogenic precooling. The small size and mass of the
nanoparticle yield both high resonance frequencies and quality factors along with low
recoil heating, which are essential conditions for ground state cooling and for low
decoherence.
Joan Hamilton
Faculty Assistant to Profs. Greiner and Lukin
HQOC Laboratory Administrator
HUCTW Local Union Representative
Harvard University
Department of Physics
17 Oxford Street
Cambridge, MA 02138
P: (617) 496-2544
F: (617) 496-2545
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***HQOC/ITAMP Joint Quantum Sciences Seminar***
**April 3, 2013 at 4:00 PM - Jefferson 250**
*Prof. Romain Quidant, ICREA Professor, ICFO*
"Shining a (Bright) Light on the Very Small"
Extensive research in Nano-optics over the last decade has made possible controlling
optical fields on the nanometer scale. Such concentration of light, well below the limit
of
diffraction opens plenty of new routes towards enhanced interaction with tiny amounts of
matter down to the single molecule/atom level. In this talk we will present our recent
advances in enhanced light-matter interaction on the nanometer scale and their
applications to quantum optics.
We first discuss the controlled electromagnetic coupling of single to few quantum emitters
with plasmonic nano-antennas. For this purpose, we developed a fabrication technique
that enables accurate positioning of said quantum dot(s) at a predefined location of the
antenna. Our experiments first shows that the antenna can be designed to efficiently
control the emission properties of the quantum emitters. Using the same technique, we also
demonstrate that a single qdot can be used to probe the optical near field of the
antenna.
In the second part of the talk we discuss a different approach in which light is used to
trap and manipulate a single nanodiamond containing a single nitrogen vacancy. We
demonstrate both translational and angular control of the trapped NV and discuss
applications to vectorial magnetometry and mapping of the electromagnetic local density
of states.
The final part of the talk presents our recent advances in optomechanics. We optically
trap a single nanoparticle in high vacuum and cool its three spatial degrees of freedom
by
means of active parametric feedback. Using a single laser beam for both trapping and
cooling we demonstrate a temperature compression ratio of four orders of magnitude. The
absence of a clamping mechanism provides robust decoupling from the heat bath and
eliminates the requirement of cryogenic precooling. The small size and mass of the
nanoparticle yield both high resonance frequencies and quality factors along with low
recoil heating, which are essential conditions for ground state cooling and for low
decoherence.
Joan Hamilton
Faculty Assistant to Profs. Greiner and Lukin
HQOC Laboratory Administrator
HUCTW Local Union Representative
Harvard University
Department of Physics
17 Oxford Street
Cambridge, MA 02138
P: (617) 496-2544
F: (617) 496-2545