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arXiv 2304.09604physics.optics
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光子时间晶体中的缺陷

Defect in Photonic Time Crystals

Snehashis Sadhukhan, Somnath Ghosh

AI总结:

本文在光子时间晶体中引入孤立时间缺陷,发现其可在特定动量k_d处使透射率和反射率接近1,并通过调控缺陷的时间与介电特性控制光放大。

摘要:

光子时间晶体(PTCs)提供了一个全新的平台,由于电磁特性的周期性变化,其表现出光波放大效应。控制这种放大的需求正变得日益重要,尤其是在基于超表面的PTCs实际实现出现之后。本工作在PTCs中引入孤立的时间缺陷,以建立对放大进行控制的新自由度。我们发现,在缺陷存在的情况下,对于带隙内的一个特定动量值(k_d),透射率和反射率变得接近1,同时对放大量产生显著影响。我们展示了时间缺陷对强度随PTC周期指数增长的影响。该效应主要取决于PTC的Floquet频率,该频率在k_d处变为实数,从而作为带隙传播的结果产生四个脉冲而非两个脉冲。我们进一步证明,通过调控缺陷的时间特性和介电特性,可以调节动量中的缺陷态,以满足特殊应用的设计需求。

英文摘要:

Photonic Time Crystals (PTCs) provide a completely new platform exhibiting light wave amplification owing to periodically varying electromagnetic properties. The need to control this amplification is becoming increasingly important, especially with the emergence of meta surface based practical realization of PTCs. The work introduces isolated temporal defect in PTCs to establish a new degree of control over the amplification. We find that in presence of the defect, the transmittance and reflectance become close to unity for a specific value of momentum (k_d) within the bandgaps accompanied by a significant impact on the amount of amplification. We show the impact of the temporal defect on the exponential growth of intensity with PTC periods. The effect primarily depends on the Floquet frequency of the PTC that becomes real at k_d giving rise to four pulses instead of two as an outcome of gap propagation. We further demonstrate that by manipulating the temporal and dielectric properties of the defect, the defect state in momentum can be tuned to serve the design interest for specialty applications.

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