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 全部栏目  Stefano Longhi
Liang Feng
摘要 + ：(浏览：348次) | 请注意：下载全文可能需要登录或支付相关费用 Recent experiments demonstrated that chiral symmetry breaking at an exceptional point (EP) is a viable route to achieve unidirectional laser emission in microring lasers. By a detailed semiconductor laser rate equation model, we show here that unidirectional laser emission at an EP is a robust regime. Slight deviations from the EP condition can break preferential unidirectional lasing near threshold via a Hopf instability. However, above a “second” laser threshold, unidirectional emission is restored.  PDF全文 (下载：98) Photonics Research ，2017年第5卷第6期 pp.B1 Xi Wang
Xing Jiang
Qi You
Jun Guo
Xiaoyu Dai
Yuanjiang Xiang
摘要 + ：(浏览：180次) | 请注意：下载全文可能需要登录或支付相关费用 In this paper, we have shown that perfect absorption at terahertz frequencies can be achieved by using a composite structure where graphene is coated on one-dimensional photonic crystal (1DPC) separated by a dielectric. Due to the excitation of optical Tamm states (OTSs) at the interface between the graphene and 1DPC, a strong absorption phenomenon occurs induced by the coupling of the incident light and OTSs. Although the perfect absorption produced by a metal–distributed Bragg reflector structure has been researched extensively, it is generally at a fixed frequency and not tunable. Here, we show that the perfect absorption at terahertz frequency not only can be tuned to different frequencies but also exhibits a high absorption over a wide angle range. In addition, the absorption of the proposed structure is insensitive to the polarization, and multichannel absorption can be realized by controlling the thickness of the top layer. PDF全文 (下载：106) Photonics Research ，2017年第5卷第6期 pp.000536 |