Journal
SCIENCE
Volume 375, Issue 6583, Pages 884-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abl6571
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Funding
- DARPA [D18AP00058]
- Office of Naval Research [N00014-16-1-2640, N00014-18-1-2347, N00014-19-1-2052, N00014-20-1-2522, N00014-20-1-2789]
- Army Research Office [W911NF-17-1-0481]
- National Science Foundation [ECCS 1454531, DMR 1420620, ECCS 1757025, CBET 1805200, ECCS 2000538, ECCS 2011171]
- Air Force Office of Scientific Research [FA9550-14-1-0037, FA9550-20-1-0322, FA9550-21-1-0202]
- US-Israel Binational Science Foundation (BSF) [2016381]
- Jet Propulsion Laboratory [013385-00001]
- European Commission [MSCA-RISE 691209]
- Austrian Science Fund (FWF) project WAVELAND [P32300]
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Shaping the light emission characteristics of laser systems is crucial in various fields. By designing a specific structure, researchers demonstrate how to form a pair of orthogonal states in a laser cavity, which can be utilized for developing versatile mode-selective devices and exploring the topological features of exceptional points.
Shaping the light emission characteristics of laser systems is of great importance in various areas of science and technology. In a typical lasing arrangement, the transverse spatial profile of a laser mode tends to remain self-similar throughout the entire cavity. Going beyond this paradigm, we demonstrate here how to shape a spatially evolving mode such that it faithfully settles into a pair of bi-orthogonal states at the two opposing facets of a laser cavity. This was achieved by purposely designing a structure that allows the lasing mode to encircle a non-Hermitian exceptional point while deliberately avoiding non-adiabatic jumps. The resulting state transfer reflects the unique topology of the associated Riemann surfaces associated with this singularity. Our approach provides a route to developing versatile mode-selective active devices and sheds light on the interesting topological features of exceptional points.
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