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On‐Chip Polarization Rotators
Author(s) -
Hou ZhiShan,
Xiong Xiao,
Cao JiaJi,
Chen QiDai,
Tian ZhenNan,
Ren XiFeng,
Sun HongBo
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900129
Subject(s) - polarization (electrochemistry) , router , femtosecond , photon , quantum entanglement , quantum information science , optics , optoelectronics , materials science , photon polarization , chip , polarization rotator , physics , quantum , laser , telecommunications , computer science , birefringence , quantum mechanics , computer network , chemistry
On‐chip polarization manipulation is proposed via a waveguide that is adiabatically twisted along its longitudinal axis, which can be fundamental building blocks for polarization‐encoded optical communication and information processing. With the help of femtosecond direct laser writing, the polarization rotators for both telecom and visible wavelengths are fabricated, which show polarization conversion efficiencies of >90% at 1550 nm and ≈80% at 646 nm, respectively. Furthermore, a polarization router consisting of multiple waveguides with different twisting angles is demonstrated. With the polarization router, photons with different polarizations are directed to different paths. Based on such platform, the path entanglement between the photons can be transformed to polarization entanglement, which will extend the quantum information technology to higher‐dimensional Hilbert space.