Ultranarrow polaritonic cavities formed by one‐dimensional junctions of two‐dimensional in‐plane heterostructures
Year: 2025
Type: article
Abstract: We propose two‐dimensional (2D) in‐plane heterostructures, composed of a 2D crystal adjoining a perfect electric conductor (PEC) plane, that enable ultranarrow polaritonic resonant cavities. Specifically, we theoretically investigate the interaction of 2D surface polaritons (2DSPs) with the junction between the 2D crystal and a PEC plane. We reveal that when 2DSPs are strongly confined, the reflected 2DSPs experience a phase shift of 3 π /4, which exhibits π /2 deviation from the so‐called edge reflection value. This non‐trivial phase shift is shown to play a crucial role in enabling resonant cavities whose size can be far smaller than the wavelength of the 2DSPs. Furthermore, we demonstrate that the spatial dimensionality of our heterostructure allows a direct mapping to metasurface‐based heterostructures, where the 2D crystal is replaced by a metasurface supporting spoof surface polaritons (SSPs). This correspondence extends the feasibility of our concept to SSP‐based resonators and broadens the accessible frequency range into the terahertz and microwave regimes. Our work provides not only deeper insight into low‐dimensional polariton optics but also a design strategy for ultracompact polaritonic metaresonators.
Source: Nanophotonics
Authors: Seojoo Lee, Ji‐Hun Kang
Institutions: Korea University, Cornell University, Kongju National University
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,995
Awards: G4380639863, G6724978804
OpenAlex ID: W4416716935