Ghost-induced exact degeneracies

Debnath, Sanjay; Khan, Emroz; Narimanov, Evgenii E.

doi:10.1364/ol.416775

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Also of great interest is the study of resonant excitation and coupling mechanisms, as well as the possibility to attain exceptional points and other singularities by coupling two GLWs. , Finally, it would be interesting to explore to what extent some typical features of LWs (e.g., chiral coupling, unidirectional excitation, robustness to bend/curvature) are extended to GLWs.…”

Section: Discussionmentioning

confidence: 99%

“…10 On the other hand, GWs are complex bound modes that rely on broken symmetries for their realization, with the necessity to operating with biaxial and slanted optical axes with respect to an interface. Far from being physical oddities of mere academic concern, GWs and GSPs exhibit several unusual features of great interest, including the possibility to exponentially enhance and modulate incident evanescent waves via resonant coupling mechanisms, 3 to attain exact frequency degeneracies in guided modes 11 and to control nanoscale light propagation via the optical-axis orientation. 9 These may find important applications in a variety of scenarios, ranging from integrated waveguides and nonlinear optics 3,11 in optical sensing 12 and subdiffraction imaging.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Far from being physical oddities of mere academic concern, GWs and GSPs exhibit several unusual features of great interest, including the possibility to exponentially enhance and modulate incident evanescent waves via resonant coupling mechanisms, 3 to attain exact frequency degeneracies in guided modes 11 and to control nanoscale light propagation via the optical-axis orientation. 9 These may find important applications in a variety of scenarios, ranging from integrated waveguides and nonlinear optics 3,11 in optical sensing 12 and subdiffraction imaging. 9 Expanding the aforementioned features and their associated applications to flat-optics platforms becomes a fascinating development.…”

Section: ■ Introductionmentioning

confidence: 99%

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Ghost Line Waves

et al. 2023

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Time-harmonic electromagnetic plane waves in anisotropic media can exhibit complex-valued wavevectors (with nonzero real and imaginary parts) even in the absence of material dissipation. These peculiar modes, usually referred to as "ghost waves", hybridize the typical traits of conventional propagating and evanescent waves, displaying both phase accumulation and purely reactive exponential decay away from the direction of the power flow. Their existence has been predicted in several scenarios and has been recently observed experimentally in the form of surface phonon polaritons with complexvalued out-of-plane wavevectors propagating at the interface between air and a natural uniaxial crystal with slanted optical axis. Here, we demonstrate that ghost waves can arise also in lower-dimensional flatoptics scenarios, which are becoming increasingly relevant in the context of metasurfaces and in the field of polaritonics. Specifically, we show that planar junctions between isotropic and anisotropic metasurfaces can support "ghost line waves" that propagate unattenuated along the line interface, exhibiting phase oscillations combined with evanescent decay both in the plane of the metasurface (away from the interface) and out-of-plane in the surrounding medium. Our theoretical results, validated by finiteelement numerical simulations, demonstrate a novel form of polaritonic waves with highly confined features, which may provide new opportunities for the control of light at the nanoscale and may find potential applications in a variety of scenarios, including integrated waveguides, nonlinear optics, optical sensing, and subdiffraction imaging.

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Section: Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Ghost Line Waves

et al. 2023

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“…The oscillatory character of ghost surface waves leads to new type of mode interaction [28] which can give rise to frequency degeneracies in the form of exceptional points. When two ghost waves interact through a spatial overlap of their fields, the oscillations in the exponential tail qualitatively changes the nature of coupling between the two modes.…”

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confidence: 99%