Opt Lett. 2023 Feb 1;48(3):755-758. doi: 10.1364/OL.482912.
Two coupled resonance modes can lead to exotic transmission spectra due to internal interference processes. Examples include electromagnetically induced transparency (EIT) in atoms and mode splitting in optics. The ability to control individual modes plays a crucial role in controlling such transmission spectra for practical applications. Here we experimentally demonstrate a controllable EIT-like mode splitting in a single microcavity using a double-port excitation. The mode splitting caused by internal coupling between two counter-propagating resonances can be effectively controlled by varying the power of the two inputs, as well as their relative phase. Moreover, the presence of asymmetric scattering in the microcavity leads to chiral behaviors in the mode splitting in the two propagating directions, manifesting itself in terms of a Fano-like resonance mode. These results may offer a compact platform for a tunable device in all-optical information processing.
两个耦合的共振模式由于内部干涉过程可以导致奇特的传输谱。例如，原子中的电磁感应透明（EIT）和光学中的模式分裂。控制单个模式的能力对于控制此类传输谱在实际应用中起着至关重要的作用。在这里，我们使用双端口激发实验证明了在单个微腔中可控的类 EIT 模式分裂。两个相反传播的共振之间的内部耦合引起的模式分裂可以通过改变两个输入的功率以及它们的相对相位来有效控制。此外，微腔中的不对称散射导致在两个传播方向上的模式分裂出现手性行为，表现在类似于 Fano 的共振模式中。这些结果可能为全光信息处理中的可调谐器件提供一个紧凑的平台。
