2017
DOI: 10.1364/ol.42.001301
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Optically switchable directional invisibility

Abstract: It is shown that a scatterer can be designed to be directionally invisible for an incident field composed of a given sum of plane waves. These scatterers are invisible only when all plane waves are present with the given amplitudes and directions of incidence, which suggests a new type of "switchable" invisibility. Such objects could find application in optical devices such as couplers, switches, and optical position sensors. It is also demonstrated that the designed scatterers have balanced gain-loss profiles… Show more

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Cited by 5 publications
(4 citation statements)
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(26 reference statements)
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“…It can be achieved by using asymmetric configurations with balanced gain and loss parameters or, equivalently, refractive indices satisfying the relation n(r)=n(r) . PT‐symmetric photonic structures have revealed exotic and interesting optical functionalities, such as coherent perfect absorption and lasing, asymmetric diffraction, unidirectional invisibility, nonreciprocal light propagation, and extraordinary nonlinear effects . In these systems, a special frequency point exists, named exceptional point (EP), where the two eigenvalues of the system merge and the effective non‐Hermitian Hamiltonian becomes defective .…”
Section: Introductionmentioning
confidence: 99%
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“…It can be achieved by using asymmetric configurations with balanced gain and loss parameters or, equivalently, refractive indices satisfying the relation n(r)=n(r) . PT‐symmetric photonic structures have revealed exotic and interesting optical functionalities, such as coherent perfect absorption and lasing, asymmetric diffraction, unidirectional invisibility, nonreciprocal light propagation, and extraordinary nonlinear effects . In these systems, a special frequency point exists, named exceptional point (EP), where the two eigenvalues of the system merge and the effective non‐Hermitian Hamiltonian becomes defective .…”
Section: Introductionmentioning
confidence: 99%
“…By accounting the effect of nonlinearity into PT‐symmetric devices operating at the broken PT‐symmetric phase, away from the EP, where a spectral singularity exists, or other passive asymmetric systems, the transmission can become nonreciprocal and the Lorentz reciprocity law is broken . The asymmetric transmission is of great importance to many photonic applications, such as optical diodes, isolators, and cloaks . However, passive nonlinear nonreciprocal systems suffer from fundamental physical bounds between their nonreciprocal transmission contrast and asymmetric field distribution .…”
Section: Introductionmentioning
confidence: 99%
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“…Scattering is of great importance in physics, astronomy, chemistry, meteorology, biology, and in other fields. Scattering of electromagnetic fields from a medium which fluctuates both in space and in time has been studied extensively in recent years [1][2][3][4][5][6][7][8][9]. The scattering medium may be deterministic or random, continuous or discrete.…”
Section: Introductionmentioning
confidence: 99%