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Topological interface states in multiscale spoof-insulator-spoof waveguides
Optics Letters
|August 13, 2016
Summary
Researchers demonstrate topological interface states in multiscale spoof-insulator-spoof (MSIS) waveguides. These localized states, analogous to photonic crystal phenomena, show promise for advanced miniaturized microwave devices.
Area of Science:
- Condensed Matter Physics
- Electromagnetism
- Materials Science
Background:
- Spoof surface plasmon polaritons (spoof SPPs) propagate along spoof-insulator-spoof (SIS) structures.
- Periodic modulation of SIS waveguides creates multiscale SIS (MSIS) structures with band gaps for spoof SPPs.
Purpose of the Study:
- To investigate topological interface states in MSIS waveguides.
- To experimentally verify the existence and properties of these states.
Main Methods:
- Fabrication of MSIS waveguides with differing topological properties.
- Experimental observation of localized interface states.
- Measurement of interface state decay lengths and comparison with numerical simulations.
Main Results:
- Experimental observation of topological interface states at the junction of two MSIS waveguides with inverted Zak phases.
- Excellent agreement between measured and numerically simulated decay lengths of the interface states.
Conclusions:
- The study successfully demonstrates topological interface states in MSIS waveguides.
- These findings confirm the analogy between photonic crystals and MSIS structures regarding topological phenomena.
- The localized interface states offer potential for developing novel miniaturized microwave devices.
