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High contrast all-optical diode based on direction-dependent optical bistability within asymmetric ring cavity
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We propose a simple all-optical diode which is comprised of an asymmetric ring cavity containing a two-level atomic ensemble. Attributed to spatial symmetry breaking of the ring cavity, direction-dependent optical bistability is obtained in a classical bistable system. Therefore, a giant optical non-reciprocity is generated, which guarantees an all-optical diode with a high contrast up to 22 d B. Furthermore, its application as an all-optical logic AND gate is also discussed. 相似文献
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采用不同方法B3P86、B3LYP、B3PW91和MP2,结合Dunning的相关一致基组cc-PVTZ,对聚合型铝氢化物(AlH3)n(n=1-3)分子的可能几何构型进行优化计算,通过比较计算结果,发现密度泛函DFT中的方法B3P86计算的能量最低.本文采用B3P86方法得出最稳定构型的几何参数、电子结构、振动频率等性质参数,并给出最稳定结构的总能量(ET)、结合能(EBT)、平均结合能(Eav)、电离势(EIP)、能隙(Eg)、费米能级(EF)和差分吸附氢原子能(Ediff).结果表明:三种铝氢化物分子基态都为1重态,电子态都为 ; AlH3分子的最稳定几何构型为 的平面三角形结构;Al2H6为对称性乙烯式 立体结构,H-Al之间生成氢桥式三中心双电子键;Al3H9为 立体结构,也生成氢桥式三中心双电子键,但三个氢桥三中心双电子键彼此隔离.最后分析了三种氢化物的红外和拉曼光谱、平均结合能、电离势、能隙和费米能级等特性,说明(AlH3)n(n=1-3)三分子中Al3H9最稳定,H-Al桥键键长比端键更长,红外光谱强度最大,差分吸附氢原子能最大,具有较强的储氢性能. 相似文献
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CH自由基在外电场中的分子结构和势能函数 总被引:1,自引:0,他引:1
运用密度泛函B3P86方法,结合Dunning的相关一致五重基cc-PV5Z,获得了CH自由基分子在不同外电场中的键长、偶极矩和振动频率等物理性质参数.通过分析物理性质参数的变化,判断离解电场所处的范围,设置合适的参数扫描该范围的单点能获得势能曲线.结果表明物理性质参数和势能值随外电场的变化而变化,且反向电场中变化幅度较大.利用Morse势模型拟合无外场下势能函数,得到的拟合参数与实验值吻合较好,采用偶极近似构建外电场下的势能函数模型,编制程序拟合对应的势能函数,得出拟合参数,进而计算临界离解电场参量,结果与数值计算值较为一致,说明构建的模型是可靠和准确的.这为分析外场下分子光谱、动力学特性和分子Stark效应冷却囚禁提供重要的理论和实验参考. 相似文献
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Single-photon interconnector composed of two individual one-dimensional nano-waveguides and a single emitter
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Recently, theoretical and experimental nano-sized fundamental devices for optical circuits have been proposed at the single-photon level. The assembly of a realistic optical circuit is now a reality. In this work, we introduce a single-photon interconnector composed of two individual nanowires and an optical N-type four-level emitter that can turn the optical connection on and off optically. Because of dipole-induced transmission at the single-photon level, a single photon can travel between the two nanowires reciprocally, which guarantees its application as an all-optical interconnector. 相似文献
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Manipulation of nonreciprocal unconventional photon blockade in a cavity-driven system composed of an asymmetrical cavity and two atoms with weak dipole-dipole interaction
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Xinqin Zhang 《中国物理 B》2022,31(7):74204-074204
We present a work of manipulating collective unconventional photon blockade (UCPB) and nonreciprocal UCPB (NUCPB) in a cavity-driven system composed of an asymmetrical single-mode cavity and two interacting identical two-level atoms (TLAs). When the atoms do not interact directly, the frequency and intensity restrictions of collective UCPB can be specified, and a giant NUCPB exists due to the splitting of optimal atom-cavity coupling strength in proper parameter regime. However, if a weak atom-atom interaction which provides a new and feeble quantum interference pathway to UCPB is taken into account, two restrictions of UCPB are combined complexly, which are rigorous to be matched simultaneously. Due to the push-and-pull effect induced by weak dipole-dipole interaction, the UCPB regime is compressed more or less. NUCPB is improved as a higher contrast is present when the two complex UCPB restrictions are matched, while it is suppressed when the restrictions are mismatched. In general, whether NUCPB is suppressed or promoted depends on its working parameters. Our findings show a prospective access to produce giant quantum nonreciprocity by a couple of weakly interacting atoms. 相似文献
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Molecular properties and potential energy function model of BH under external electric field
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Using the density functional B3P86/cc-PV5Z method, the geometric structure of BH molecule under different external electric fields is optimized, and the bond lengths, dipole moments, vibration frequencies, and other physical properties parameters are obtained. On the basis of setting appropriate parameters, scanning single point energies are obtained by the same method and the potential energy curves under different external fields are also obtained. These results show that the physical property parameters and potential energy curves may change with external electric field, especially in the case of reverse direction electric field. The potential energy function without external electric field is fitted by Morse potential, and the fitting parameters are obtained which are in good agreement with experimental values. In order to obtain the critical dissociation electric parameter, the dipole approximation is adopted to construct a potential model fitting the corresponding potential energy curve of the external electric field. It is found that the fitted critical dissociation electric parameter is consistent with numerical calculation, so that the constructed model is reliable and accurate. These results will provide important theoretical and experimental reference for further studying the molecular spectrum, dynamics, and molecular cooling with Stark effect. 相似文献
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聚合型铝氢化物(AlH3)n(n=1-3)的几何结构与振动光谱的研究 总被引:1,自引:0,他引:1
采用不同方法B3P86、B3LYP、B3PW91和MP2,结合Dunning的相关一致基组cc-PVTZ,对聚合型铝氢化物(AlH3)n(n=1-3)分子的可能几何构型进行优化计算,通过比较计算结果,发现密度泛函DFT中的方法B3P86计算的能量最低.本文采用B3P86方法得出最稳定构型的几何参数、电子结构、振动频率等性质参数,并给出最稳定结构的总能量(ET)、结合能(EBT)、平均结合能(Eav)、电离势(EIP)、能隙(Eg)、费米能级(EF)和差分吸附氢原子能(Ediff).结果表明:三种铝氢化物分子基态都为1重态,电子态都为 ; AlH3分子的最稳定几何构型为 的平面三角形结构;Al2H6为对称性乙烯式 立体结构,H-Al之间生成氢桥式三中心双电子键;Al3H9为 立体结构,也生成氢桥式三中心双电子键,但三个氢桥三中心双电子键彼此隔离.最后分析了三种氢化物的红外和拉曼光谱、平均结合能、电离势、能隙和费米能级等特性,说明(AlH3)n(n=1-3)三分子中Al3H9最稳定,H-Al桥键键长比端键更长,红外光谱强度最大,差分吸附氢原子能最大,具有较强的储氢性能. 相似文献
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