Anti-Parity-Time Symmetry in Passive Nanophotonics
- URL: http://arxiv.org/abs/2003.11151v1
- Date: Tue, 24 Mar 2020 23:36:03 GMT
- Title: Anti-Parity-Time Symmetry in Passive Nanophotonics
- Authors: Heng Fan, Jiayang Chen, Zitong Zhao, Jianming Wen, Yuping Huang
- Abstract summary: Parity-time (PT) symmetry in non-Hermitian optical systems promises distinct optical effects and applications not found in conservative optics.
Our results highlight exotic anti-Hermitian nanophotonics to be consolidated with conventional circuits on the same chip.
- Score: 11.38706579406188
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Parity-time (PT) symmetry in non-Hermitian optical systems promises distinct
optical effects and applications not found in conservative optics. Its
counterpart, anti-PT symmetry, subscribes another class of intriguing optical
phenomena and implies complementary techniques for exotic light manipulation.
Despite exciting progress, so far anti-PT symmetry has only been realized in
bulky systems or with optical gain. Here, we report an on-chip realization of
non-Hermitian optics with anti-PT symmetry, by using a fully-passive,
nanophotonic platform consisting of three evanescently coupled waveguides. By
depositing a metal film on the center waveguide to introduce strong loss, an
anti-PT system is realized. Using microheaters to tune the waveguides'
refractive indices, striking behaviors are observed such as equal power
splitting, synchronized amplitude modulation, phase-controlled dissipation, and
transition from anti-PT symmetry to its broken phase. Our results highlight
exotic anti-Hermitian nanophotonics to be consolidated with conventional
circuits on the same chip, whereby valuable chip devices can be created for
quantum optics studies and scalable information processing.
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