Ultimate Light Trapping in a Free-Form Plasmonic Waveguide

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Slow light enables spatiotemporal manipulation of electromagnetic waves at the nanoscale and allows access to a plethora of nonlinear optical phenomena. Although the guided waves in plasmonic waveguides are known to inherently possess a slow energy velocity, their ultimate light-trapping performance remains unknown as the effect of the waveguide's shape alteration has not been considered systematically so far. In this work, we theoretically demonstrate a free-form optimized metal-insulator-metal plasmonic waveguide for light trapping that exhibits a quality factor several times higher than that of the conventional linearly tapered structures. The quality factor of the optimized waveguide saturates to the theoretical limit at a surprisingly short device length, which shows a nontrivial inverse logarithmic dependence on the material loss. The demonstrated design has a quality-factor-to-footprint ratio comparable to that of state-of-the-art photonic cavities.
Publisher
AMER PHYSICAL SOC
Issue Date
2019-08
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW APPLIED, v.12, no.2

ISSN
2331-7019
DOI
10.1103/PhysRevApplied.12.024030
URI
http://hdl.handle.net/10203/265548
Appears in Collection
EE-Journal Papers(저널논문)
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