English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Realization of chip-scale nonreciprocal optics such as isolators andcirculators is highly demanding for all-optical signal routing and protectionwith standard photonics foundry process. Owing to the significant challenge forincorporating magneto-optical materials on chip, the exploration ofmagnetic-free alternatives has become exceedingly imperative in integratedphotonics. Here, we demonstrate a chip-based, tunable all-optical isolator atthe telecommunication band based upon bulk stimulated Brillouin scattering(SBS) in a high-Q silica microtoroid resonator. This device exhibits remarkablecharacteristics over most state-of-the-art implements, including high isolationratio, no insertion loss, and large working power range. Thanks to the guidedacoustic wave and accompanying momentum-conservation condition, SBS alsoenables us to realize the first nonreciprocal parity-time symmetry in twodirectly-coupled microresonators. The breach of time-reversal symmetry furthermakes the design a versatile arena for developing many formidable ultra-compactdevices such as unidirectional single-mode Brillouin lasers and supersensitivephotonic sensors.

On-chip optical isolator and nonreciprocal parity-time symmetry induced by stimulated Brillouin scattering