文章基本信息

标题：Ring quantum cascade lasers with twisted wavefronts
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作者：Rolf Szedlak ; Thomas Hisch ; Benedikt Schwarz 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：7998
DOI：10.1038/s41598-018-26267-x
语种：English
出版社：Springer Nature
摘要：We demonstrate the on-chip generation of twisted light beams from ring quantum cascade lasers. A monolithic gradient index metamaterial is fabricated directly into the substrate side of the semiconductor chip and induces a twist of the light’s wavefront. This significantly influences the obtained beam pattern, which changes from a central intensity minimum to a maximum depending on the discontinuity count of the metamaterial. Our design principle provides an interesting alternative to recent implementations of microlasers operating at an exceptional point.