Dynamically reconfigurable topological edge state in phase change photonic crystals

Cao, Tun; Fang, Linhan; Cao, Ying; Li, Nan; Fan, Zhiyou; Tao, Zhiguo

doi:10.1016/j.scib.2019.02.017

Cited by 70 publications

(28 citation statements)

References 56 publications

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“…Therefore, reconfigurable topological systems that support topological phase transitions that can be manipulated are essential. Dynamic control of topological phase transitions has been achieved using liquid crystals 228 , a phase-change material under temperature variation 229,230 and transparent conducting oxides under optical pumping 231 . A reconfigurable photonic topological system that supports selective propagation of topological edge modes under mechanical modulation was demonstrated using a bianisotropic photonic crystal 150 .…”

Section: Topological Photonics Towards Applicationsmentioning

confidence: 99%

Recent advances in 2D, 3D and higher-order topological photonics

2020

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Over the past decade, topology has emerged as a major branch in broad areas of physics, from atomic lattices to condensed matter. In particular, topology has received significant attention in photonics because light waves can serve as a platform to investigate nontrivial bulk and edge physics with the aid of carefully engineered photonic crystals and metamaterials. Simultaneously, photonics provides enriched physics that arises from spin-1 vectorial electromagnetic fields. Here, we review recent progress in the growing field of topological photonics in three parts. The first part is dedicated to the basics of topological band theory and introduces various two-dimensional topological phases. The second part reviews three-dimensional topological phases and numerous approaches to achieve them in photonics. Last, we present recently emerging fields in topological photonics that have not yet been reviewed. This part includes topological degeneracies in nonzero dimensions, unidirectional Maxwellian spin waves, higher-order photonic topological phases, and stacking of photonic crystals to attain layer pseudospin. In addition to the various approaches for realizing photonic topological phases, we also discuss the interaction between light and topological matter and the efforts towards practical applications of topological photonics.

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Section: Topological Photonics Towards Applicationsmentioning

confidence: 99%

Recent advances in 2D, 3D and higher-order topological photonics

2020

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“…In practical applications, however, multiple photonic topological functionalities are expected to be achieved in a single but reconfigurable PTI, so that the time and costs associated with the design and fabrication process can be reduced. To this end, several key works on reconfigurable topological insulators [20][21][22][23][24][25] have been reported recently, in which the reconfigurability is mostly implemented by changing either the geometry or material parameters. Unfortunately, these features in PTIs cannot be easily altered once the photonic structure has been fabricated.…”

Section: Introductionmentioning

confidence: 99%

Reprogrammable plasmonic topological insulators with ultrafast control

You

Lan

et al. 2021

Preprint

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Topological photonics has revolutionized our understanding of light propagation, providing a remarkably robust way to manipulate light. Despite the intensive research and rapid progress in this field, most of existing studies are focused on designing a static photonic structure to realize a specific topological functionality or phenomenon. Developing a dynamic and universal photonic topological platform to intelligently switch multiple topological functionalities at ultrafast speed is still a great challenge. Here we theoretically propose and experimentally demonstrate an ultrafast reprogrammable plasmonic topological insulator, where the topological propagation route can be dynamically changed at nanosecond-level switching time, which is more than 1×10^7 times faster than the current state-of-the-art, leading to an experimental demonstration of unprecedentedly ultrafast multi-channel optical analog-digital converter. This orders-of-magnitude improvement compared to previous works is due to the innovative use of ultrafast electric switches to implement the programmability of our plasmonic topological insulator, which enables us to precisely encode each unit cell by dynamically controlling its digital plasmonic states while keeping its geometry and material parameters unchanged. Our reprogrammable topological plasmonic platform can be fabricated by the widely-used printed circuit board technology, making it much more attractive and compatible with current highly integrated photoelectric systems. Furthermore, due to its flexible programmability, many existing photonic topological functionalities can be integrated into this versatile topological platform. Our work brings the current studies of photonic topological insulators to a digital and intelligent era, which could open new avenues towards the development of software-defined photoelectric elements in high-speed communications and computation-based intelligent devices with built-in topological protection.

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“…Hence, phase change materials (PCMs) seem to be good choices. [39][40][41][42][43] PCMs can regulate the optical properties of the prepared PTIs in a relatively short period. Take Ge-Sb-Te (GST) alloys as an example.…”

Section: Introductionmentioning

confidence: 99%

Tunable and Reconfigurable Higher‐Order Topological Insulators in Photonic Crystals with Phase Change Materials

Zhang

et al. 2021

Annalen der Physik

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Higher-order topological insulators (HOTIs) have attracted great interest due to the unconventional bulk-boundary correspondence. However, the realization of HOTIs usually requires a geometrical transformation of the photonic crystals (PhCs), setting high demands on the manufacturing process. Here a scheme is reported of tunable and reconfigurable HOTIs with phase change materials (PCMs) by controlling the temperature. The temperature change can transform the amorphous states to crystalline states, leading to the reconfigurable edge states and corner states. It is proven that both Sb 2 S 3 and Sb 2 Se 3 can support the reconfigurable HOTIs at the phase change temperature 270 °C at different wavelengths. This work discovers a new platform for the practical implementation of high-order topological phase transition optical apparatus in the foreseeable future, such as nanocavities, waveguides, and metasurfaces.

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Dynamically reconfigurable topological edge state in phase change photonic crystals

Cited by 70 publications

References 56 publications

Recent advances in 2D, 3D and higher-order topological photonics

Recent advances in 2D, 3D and higher-order topological photonics

Reprogrammable plasmonic topological insulators with ultrafast control

Tunable and Reconfigurable Higher‐Order Topological Insulators in Photonic Crystals with Phase Change Materials

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