Browsing by Author "Ye, Yuqian"

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Self-induced spin polarization in active photonic devices without extrinsic magnetism
(2013-01-01)
Chang, Shu-Wei
;
Ye, Yuqian
;
光電工程學系
;
Department of Photonics
We theoretically incorporate chirality into laser cavities and utilize it to demonstrate circularly-polarized resonant modes. In absence of extrinsic magnetism, these modes may induce a net spin polarization via selection rules when lasing. (C) 2013 Optical Society of America
Self-induced spin-polarized carrier source in active photonic device with artificial optical chirality
(2012-10-29)
Ye, Yuqian
;
Chang, Shu-Wei
;
光電工程學系
;
Department of Photonics
We demonstrate a scheme of active photonic devices which can spontaneously polarize the carrier spin in active regions. Rather than externally breaking the time-reversal symmetry of carrier spin states such as applying magnetic fields, only the optical chirality is required in this setup. Spin-polarized carriers are generated by interactions between carriers and self-initiated circularly polarized photons without the spin-selective optical pumping/electrical injection and breaking of the reciprocity. The device requires a cavity which supports modes with only one circular polarization and can be implemented with the vertical-cavity type of arrangements for distributed Bragg reflectors and artificial chiral photonic structures. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765082]