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Thursday, May 5, 2011

Applaud with appreciation to all the poster session’s presenters!!!

Attending poster sessions is energetic and adventurous. It is even a great social event. Compared to technical session, you never fall asleep and you can interrupt the presenters whenever you want (How great is this, you simply have a personal tutor at your disposal). In additions, you learn more in less time if your mind is a knowledge sponge.

Forgive me for sampling only today’s poster session. Actually I totally regret I didn’t spend enough time in the last few days for poster sessions. To me, these successfully poster sessions really mark one of the highlights in CLEO 2011. Here are some of them that I got a chance to interrogate the presenters (they were just busy, it was quite hard to squeeze in to ask even one question):

JThB8, Generation of a macroscopic singlet state in an atomic ensemble – I learned from this poster that you can create a spin 0 ensemble using weak optical pump coupled with active feedback. In other words, you start from cold atoms and squeeze the distribution of the spins in a way that it approaches zero expectation values in all directions through a tailored Hamiltonian. Quite amazing, but it has been realized beautifully by the researchers.

JThB25, Twin-photon correlated confocal microscopy – the lateral resolution of the microscopy is defined by the diffraction limit. A clever way to improve the resolution for more than 60% is proposed and performed by utilizing a phase plate right in front of the sample. In a nutshell, the phase plate encodes different phases for the points that are not in the vicinity on the sample. If the points on the sample were more separated, the imposed phase would be more different. A smart detection scheme then only picks up the signals that have no phase difference. By doing so, the light from one point on the sample is amplified and that from points nearby are suppressed. This greatly enhances the lateral resolution.

JThB28, Photon-phonon entanglement in a coupled optomechanical system – the entanglement of photon and phonon is studied thoroughly in this simulation work. A system with two coupled optomechanical cavities is the model system (imagining one side of the cavity is on a spring, so this cavity supports phonon modes). Two cavities are coupled by cavity-supported light modes. It is found that the light can couple the photon modes to the phonon modes of the cavity. And this entanglement lasts more than 500 seconds. This really blows my mind away; I used to think the entanglement doesn’t sustain itself for this long.

JThB42, Conical interaction dynamics in a rhodopsin analog: isorhodopsin – Ultrashort pulses (~ 10 fs) from NOPA are used to investigate the isomerization of rhodopsin (the first chemical reaction in the mechanism of “seeing things”) and isorhodopsin. By compared with the results of isorhodopsin, it is found that the isomerization of the rhodopsin molecule is actually optimized on the right chemical bond location. As a result, the efficiency is superb. Nature does her job, indeed!

JThB45, Unidirectional perfect transmission resonances in nonlinear asymmetric photonic multilayer – Combining theory and experiment, a photonic crystal multilayer, which transmits light in one direction but not the other, is realized. In one direction, the transmittance is more than 92% (the reverse direction, the transmittance is less than 20%). This is actually a one-way photonic crystal and I think applications based on this will come in the near future. The presenter is so nice and gives me some advice on the technical session -- His way of arranging the chairs will definitely increase the seating capacity by at least 2-fold. Your opinion is greatly appreciated.

JThB137, A comparative study of Raman enhancement in capillaries – OK, I have to admit, I love this one. The experiment is straightforward but so smart and neat. The laser light is guided through a hollow photonic crystal fiber by a high NA objective. The hollow fiber is filled with the solution of the chemicals. The light has very high photon density in the fiber and the interaction length of the chemicals with the light in the fiber is long. Subsequently, the Raman signal is found to increase by ~ 10-fold. 10-fold is an astronomical number to me actually, but the result confirmed this nicely done work.

Thanks again to all the poster session presenters! Bravo!!!

p.s: Just realize there is a Light Street right beside Baltimore convention center. Maybe that is why we have CLEO 2011 here!?

Light Street, Baltimore, MA!!!
The opinions expressed herein are those of the author and do not represent the Optical Society of America (OSA) or any OSA affiliate.

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