Unidirectional Invisibility Induced by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">P</mml:mi><mml:mi mathvariant="script">T</mml:mi></mml:math>-Symmetric Periodic Structures
Zin LinDepartment of Physics, Wesleyan University, Middletown, Connecticut 06459, USAHamidreza RamezaniDepartment of Physics, Wesleyan University, Middletown, Connecticut 06459, USAToni EichelkrautCollege of Optics & Photonics-CREOL, University of Central Florida, Orlando, Florida 32816, USATsampikos KottosDepartment of Physics, Wesleyan University, Middletown, Connecticut 06459, USAHui CaoDepartment of Applied Physics, Yale University, New Haven, Connecticut 06520, USADemetrios N. ChristodoulidesCollege of Optics & Photonics-CREOL, University of Central Florida, Orlando, Florida 32816, USA
2011en
ABI
Аннотация
Parity-time (PT) symmetric periodic structures, near the spontaneous PT-symmetry breaking point, can act as unidirectional invisible media. In this regime, the reflection from one end is diminished while it is enhanced from the other. Furthermore, the transmission coefficient and phase are indistinguishable from those expected in the absence of a grating. The phenomenon is robust even in the presence of Kerr nonlinearities, and it can also effectively suppress optical bistabilities.
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