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/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

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

Zendy Tools

Zendy Open

Silicon carbide has recently emerged as a promising photonics material due toits unique properties, including possessing strong second- and third-ordernonlinear coefficients and hosting various color centers that can be utilizedfor a wealth of quantum applications. Here, we report the design anddemonstration of octave-spanning microcombs in a4H-silicon-carbide-on-insulator platform for the first time. Such broadbandoperation is enabled by optimized nanofabrication achieving >1 millionintrinsic quality factors in a 36-$\mu$m-radius microring resonator, andcareful dispersion engineering by investigating the dispersion properties ofdifferent mode families. For example, for the fundamental transverse-electricmode whose dispersion can be tailored by simply varying the microring waveguidewidth, we realized a microcomb spectrum covering the wavelength range from 1100nm to 2400 nm with an on-chip power near 120 mW. While the observed comb stateis verified to be chaotic and not soliton, attaining such a large bandwidth isa crucial step towards realizing $f$-2$f$ self-referencing. In addition, wehave also observed coherent soliton-crystal state for the fundamentaltransverse-magnetic mode, which exhibits stronger dispersion than thefundamental transverse-electric mode and hence a narrower bandwidth.

Octave-spanning microcomb generation in 4H-silicon-carbide-on-insulator photonics platform