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Observation of Linear and Nonlinear Light Localization at the Edges of Moiré Arrays
A A Arkhipova1,2, Y V Kartashov1, S K Ivanov3
1Institute of Spectroscopy, Russian Academy of Sciences, 108840 Troitsk, Moscow, Russia.
Physical Review Letters
|March 10, 2023
Summary
We demonstrate light localization in truncated moiré arrays, observing unique corner modes and nonlinear surface solitons. This research pioneers understanding these phenomena in photonic systems.
Area of Science:
- Photonics and Optics
- Condensed Matter Physics
- Materials Science
Background:
- Moiré patterns arise from the superposition of periodic structures.
- Light localization phenomena are crucial in photonic systems.
- Truncation of periodic structures can induce unique optical behaviors.
Purpose of the Study:
- To investigate linear and nonlinear light localization in truncated moiré arrays.
- To experimentally characterize corner and bulk modes in these structures.
- To explore the impact of nonlinearity on light localization.
Main Methods:
- Fabrication of femtosecond-laser written moiré arrays with square sublattices twisted at Pythagorean angles.
- Experimental excitation of linear corner and bulk modes.
- Investigation of nonlinear effects on mode localization at higher input powers.
Main Results:
- Observed distinct localization properties for corner modes compared to bulk excitations.
- Demonstrated crossover from linear quasilocalized states to surface solitons with increasing input power.
- Confirmed the role of nonlinearity in mode behavior.
Conclusions:
- First experimental demonstration of light localization induced by truncation in periodic moiré photonic structures.
- Highlighting the unique properties of corner modes and nonlinear surface solitons.
- Providing insights into the control of light localization in engineered optical materials.
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