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Exclusive features of the amplification of topological temporal edge states in photonic time crystals.

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Title: Exclusive features of the amplification of topological temporal edge states in photonic time crystals.
Authors: Sadhukhan, Snehashis1 (AUTHOR), Pal, Bishnu P2 (AUTHOR), Ghosh, Somnath2 (AUTHOR) somiit@rediffmail.com
Source: Journal of Physics D: Applied Physics. 2026, Vol. 59 Issue 26, p1-11. 11p.
Subjects: Wave amplification, Optical amplifiers, Photonic crystals, Topology, Photonics
Abstract: We analyze the characteristic features of the amplification of the topological temporal edge (TTE) state in photonic time crystals (PTCs) arising from the band topology and topological phase transitions. We find that the amplification of the TTE states, which are formed at the interface of two PTCs with dissimilar (trivial and nontrivial) topological phases, can be controlled, by judicious tuning of the parameters of the first PTC, whereas variations in the second PTC have no effect. Further, exchanging the positions of the trivial and nontrivial PTCs in time yields the same phenomenon. Finally we analyze the effect of correlated temporal disorder of various (spatial equivalent of diagonal, off diagonal, and both) types and strengths introduced in the first PTC and find the TTE state remains robust up to considerable disorder levels, exhibiting the strong resilience of TTE states against imperfections, underscoring their potential for realizing disorder-immune optical amplifiers and topological photonic devices. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:We analyze the characteristic features of the amplification of the topological temporal edge (TTE) state in photonic time crystals (PTCs) arising from the band topology and topological phase transitions. We find that the amplification of the TTE states, which are formed at the interface of two PTCs with dissimilar (trivial and nontrivial) topological phases, can be controlled, by judicious tuning of the parameters of the first PTC, whereas variations in the second PTC have no effect. Further, exchanging the positions of the trivial and nontrivial PTCs in time yields the same phenomenon. Finally we analyze the effect of correlated temporal disorder of various (spatial equivalent of diagonal, off diagonal, and both) types and strengths introduced in the first PTC and find the TTE state remains robust up to considerable disorder levels, exhibiting the strong resilience of TTE states against imperfections, underscoring their potential for realizing disorder-immune optical amplifiers and topological photonic devices. [ABSTRACT FROM AUTHOR]
ISSN:00223727
DOI:10.1088/1361-6463/ae7b4b