Broadband tunable transmission non-reciprocity in thermal atoms dominated by two-photon transitions

• URL: http://arxiv.org/abs/2402.06113v1
• Date: Fri, 9 Feb 2024 00:36:09 GMT
• Title: Broadband tunable transmission non-reciprocity in thermal atoms dominated by two-photon transitions
• Authors: Hui-Min Zhao, Di-Di Zheng, Xiao-Jun Zhang, and Jin-Hui Wu
• Abstract summary: We propose a scheme for realizing broadband and tunable transmission non-reciprocity by utilizing two-photon near-resonant transitions in thermal atoms. One main advantage of this scheme lies in that the transmission non-reciprocity can be realized and manipulated in a frequency range exceeding $200$ MHz.
• Score: 3.1211344187242296
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a scheme for realizing broadband and tunable transmission non-reciprocity by utilizing two-photon near-resonant transitions in thermal atoms as single-photon far-detuned transitions can be eliminated. Our basic idea is to largely reduce the Doppler broadenings on a pair of two-photon, probe and coupling, transitions and meanwhile make the only four-photon transition Doppler-free (velocity-dependent) for a forward (backward) probe field. One main advantage of this scheme lies in that the transmission non-reciprocity can be realized and manipulated in a frequency range typically exceeding $200$ MHz with isolation ratio above $20$ dB and insertion loss below $1.0$ dB by modulating an assistant field in frequency and amplitude. The intersecting angle between four applied fields also serves as an effective control knob to optimize the nonreciprocal transmission of a forward or backward probe field, e.g. in a much wider frequency range approaching $1.4$ GHz.

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