A passive bias-free ultrabroadband optical isolator based on unidirectional self-induced transparency
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866916202927882240 |
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| author | Wu, Haodong Tang, Jiangshan Chen, Mingyuan Xiao, Min Nori, Franco Xia, Keyu Lu, Yanqing |
| author_facet | Wu, Haodong Tang, Jiangshan Chen, Mingyuan Xiao, Min Nori, Franco Xia, Keyu Lu, Yanqing |
| contents | Achieving a broadband nonreciprocal device without gain and any external bias is very challenging and highly desirable for modern photonic technologies and quantum networks. Here, we theoretically propose a passive and bias-free all-optical isolator for a femtosecond laser pulse by exploiting a new mechanism of unidirectional self-induced transparency, obtained with a nonlinear medium followed by a normal absorbing medium at one side. The transmission contrast between the forward and backward directions can reach ~14.3 dB for a 2π5 fs laser pulse, implying isolation of a signal with an ultrabroad bandwidth of 200 THz. The 20 dB bandwidth is about 57 nm, already comparable with a magneto-optical isolator. This cavity-free optical isolator may pave the way to integrated nonmagnetic isolation of ultrashort laser pulses. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2212_02347 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | A passive bias-free ultrabroadband optical isolator based on unidirectional self-induced transparency Wu, Haodong Tang, Jiangshan Chen, Mingyuan Xiao, Min Nori, Franco Xia, Keyu Lu, Yanqing Optics Pattern Formation and Solitons Achieving a broadband nonreciprocal device without gain and any external bias is very challenging and highly desirable for modern photonic technologies and quantum networks. Here, we theoretically propose a passive and bias-free all-optical isolator for a femtosecond laser pulse by exploiting a new mechanism of unidirectional self-induced transparency, obtained with a nonlinear medium followed by a normal absorbing medium at one side. The transmission contrast between the forward and backward directions can reach ~14.3 dB for a 2π5 fs laser pulse, implying isolation of a signal with an ultrabroad bandwidth of 200 THz. The 20 dB bandwidth is about 57 nm, already comparable with a magneto-optical isolator. This cavity-free optical isolator may pave the way to integrated nonmagnetic isolation of ultrashort laser pulses. |
| title | A passive bias-free ultrabroadband optical isolator based on unidirectional self-induced transparency |
| topic | Optics Pattern Formation and Solitons |
| url | https://arxiv.org/abs/2212.02347 |