Tham khảo tài liệu 'advances in optical and photonic devices 2011 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Optical Mode Properties of 2-D Deformed Microcavities 289 Fig. 11. a The topology of energy surface near an EP. b Mobius strip made by the difference of eigenvalues of interacting two modes. In a stadium-shaped microcavity the exceptional point has been found numerically near an ARC Lee . et al. 2008b in a parameter space spanned by a deformation and refractive index. Recently ARC and RC in microcavity have been experimentally observed in a deformed microcavity made by liquid jet where some discrete internal parameter instead of the refractive index is used and it is expected that the EP would be identified by observing the transition ARC to RC Lee . et al. 2009 . 7. Summary In this chapter properties of optical modes in deformed dielectric microcavities have been reviewed. Although the ray dynamics in deformed cavity is complicated through the PSOS one can easily identify the complexity of ray dynamics. The modified PSOS incorporating openness character of dielectric cavity can be characterized by the steady probability distribution SPD for fully chaotic case. This distribution reveals combination of unstablemanifold structure and openness character and it plays a role of classical skeleton for understanding Husimi functions of optical modes supported by deformed microcavities. The directional emission from a strongly deformed microcavity can be well explained by the SPD. Influence of openness changes scarred optical modes to have opposite angular shift of scarred patterns depending on the way of wave circulation and make it possible to form quasiscarred optical modes without underlying unstable periodic orbit. And the dielectric microcavity can be regarded as an example of non-Hermitian system with complex eigenvalues. The exceptional point EP degeneracy point in non-Hermitian systems can be found in deformed microcavities. Although much attention has been paid on the microcavity in the past decades and new understandings on optical modes have been .
