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Seminar: "Nanophotonics in Systems of Large Sizes" Dr. Bo Zhen

Tuesday, March 8, 2016 2:00 PM to 3:00 PM
CREOL Room 103

Dr. Bo Zhen

MIT 

Abstract: 

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].

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, 525, 354 (2015)

Biography:

Bo Zhen is a joint postdoctoral associate between at Prof. Marin Soljacic at MIT and Prof. Mordechai Segev at Technion. He received his Ph.D. in Physics from MIT in 2014. His research interests cover theoretical, numerical and experimental explorations of novel nanophotonic phenomena and their real-life applications. He was a finalist for the 2015 Carl E Anderson Division of Laser Science Dissertation Award for his work in "Nanophotonics in systems of large sizes".  

For additional information: 

Dr. Demetrios Christodoulides
demetri@creol.ucf.edu

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