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CAMP: Nanophotonics in Systems of Large Sizes

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Bo Zhen, Massachusetts Institute of Technology, and Solid State Institute, Technion, Israel
When
06 October 2015 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
Contact Name
Mikael Rechtsman
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Nanophotonic structures with patterning at the nanoscale provide unique opportunities to control light and alter its behavior in ways not possible in macroscopic structures. Over the past decade, researchers have achieved numerous successes with nanophotonic devices of small sizes, such as photonic crystal cavities or micro-ring resonators. In contrast, much fewer advances have been made in nanophotonic systems of large sizes (centimeter-scale or even larger), which are of particular interest for practical applications, such as energy harvesting, lighting, display, etc.

In this talk, I will focus on two novel resonance effects we discovered in macroscopic photonic crystals slabs of centimeter scales. The first effect is called optical bound states in the continuum, which are resonances but with infinitely long lifetimes. I will discuss our results on the experimental demonstration of such states [1, 2], their topological nature [3], as well as their applications in directional light emission and low-threshold lasers [4]. The second part of my talk will be about exceptional points, which are peculiar degeneracies that are only possible in non-Hermitian systems. I will present our recent results on the observation of a ring of exceptional points being spawned from an accidental Dirac point and the associated potential applications in optical sensing and fluorescence enhancements [5].  

Selected References:                                                                               

[1] J. Lee, et al., Observation and differentiation of unique high-Q optical resonances near zero wave vector in macroscopic photonic crystal slabs, Phys. Rev. Lett. 109, 067401 (2012).

[2] C. W. Hsu, et al., Observation of trapped light in the radiation continuum, Nature 499, 188 (2013).

[3] B. Zhen, et al., Topological nature bound states in the continuum, Phys. Rev. Lett. 113, 257401 (2014).

[4] B. Zhen, et al., Enabling enhanced emission and low-threshold lasing of organic molecules using special Fano resonances of macroscopic photonic crystals, Proc. Natl. Acad. Sci. 110, 13711 (2013)

[5] B. Zhen, et al., Spawning rings of exceptional points out of Dirac cones, Nature, in press (2015)

 Short Bio:

 Bo Zhen received a B.S. in 2008 from Tsinghua University, China, and a Ph.D. in 2014 from MIT. Since then, he has been working as a joint postdoctoral associate with Marin Soljačić at MIT and Mordechai Segev at Technion.

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