Journal
ADVANCED MATERIALS
Volume 35, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202300054
Keywords
non-Hermitian photonics; organic lasers; parity-time synthetic materials; photonic materials; tunable microlasers
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Synthetic photonic materials exploiting PT symmetry are revolutionizing the photonic sciences. However, current PT-symmetric microcavity laser systems suffer from limited laser spectral bandwidth. In this study, a reconfigurable PT-symmetric microcavity system with controllable complex refractive indices is proposed using an organic composite material system and a grayscale electron-beam direct-writing technique. The introduction of organic photoisomerizable compounds enables dynamically tunable single-mode laser output.
Synthetic photonic materials exploiting the quantum concept of parity-time (PT) symmetry lead to an emerging photonic paradigm-non-Hermitian photonics, which is revolutionizing the photonic sciences. The non-Hermitian photonics dealing with the interplay between gain and loss in PT synthetic photonic material systems offers a versatile platform for advancing microlaser technology. However, current PT-symmetric microcavity laser systems only manipulate imaginary parts of the refractive indices, suffering from limited laser spectral bandwidth. Here, an organic composite material system is proposed to synthesize reconfigurable PT-symmetric microcavities with controllable complex refractive indices for realizing tunable single-mode laser outputs. A grayscale electron-beam direct-writing technique is elaborately designed to process laser dye-doped polymer films in one single step into microdisk cavities with periodic gain and loss distribution, which enables thresholdless PT-symmetry breaking and single-mode laser operation. Furthermore, organic photoisomerizable compounds are introduced to reconfigure the PT-symmetric systems in real-time by tailoring the real refractive index of the polymer microresonators, allowing for a dynamically and continuously tunable single-mode laser output. This work fundamentally enhances the PT-symmetric photonic systems for innovative design of synthetic photonic materials and architectures.
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