a:SiNx非周期光子结构中异常的非线性光学吸收色散
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摘要(中文译文)
光子晶体中对电磁场的强约束会影响光与物质的相互作用，并被用于在所需频段产生、控制和操纵光。在此，我们展示了基于a:SiN的空间非均匀准周期光学微腔在强飞秒激光传播过程中不寻常的非线性光学响应。非周期微腔通过两个具有对比折射率和带隙的四分之一波长非化学计量富Si和富N的a:SiN层实现。利用高强度飞秒激光，通过波长依赖（740至900 nm）和角度分辨研究在光子带边（约750 nm）处探测了非周期微腔的光子区域。研究揭示了在光子带边附近从缺陷介导能级的一光子诱导可饱和吸收（SA）到双光子诱导反可饱和吸收（RSA）的不寻常切换。对称光子约束与分形富N低折射率a:SiN层（3L）高度密集的缺陷能级的强重叠直接促成了这种异常非线性光学切换。广泛的光场模拟以及与其周期性微腔对应物的比较研究有力地支持了这种不寻常的非线性。非周期微腔中分形效应诱导的谐振光子模式导致不可预测的非线性光学响应，这为光子操纵和控制建立了一种新颖且多功能的途径。因此，本研究为光子模式演化中多种不同几何主导因素及随之而来的非线性响应提供了深入见解，这进一步调控了光子器件的能力。
Abstract
The strong confinement of electromagnetic fields in photonic crystals influences light-matter interactions and is utilized for the generation, control, and manipulation of light at desired frequency bands. Here we demonstrate the unusual nonlinear optical responses of a:SiN-based spatially inhomogeneous quasi-periodic optical microcavity during intense femtosecond laser propagation. Aperiodic microcavities are realized using two quarter-wavelength nonstoichiometric Si- and N-rich a:SiN layers having contrasting refractive indices and bandgaps. The photonic region of the aperiodic microcavity was probed with high-intensity femtosecond laser using wavelength-dependent (740 to 900 nm) and angle-resolved studies at the edge (∼750 nm). The studies reveal unusual switching from one-photon-induced saturable absorption (SA) of defect-mediated energy levels to two-photon-induced reverse saturable absorption (RSA) around the photonic edge. The strong overlap of the symmetric photonic confinement with the highly dense defect energies of fractal N-rich low refractive index a:SiN layers (3L) directly expedites such anomalous nonlinear optical switching. Extensive optical field simulations and comparative studies with its periodic microcavity counterpart strongly support the unusual nonlinearities. The fractal effect-induced resonant photonic modes in an aperiodic microcavity lead to unpredictable nonlinear optical responses, which establishes a novel and versatile route for photon manipulation and control. Thus, the present study provides deep insights into many different geometrical dominances in the evolution of photonic modes and consequent nonlinear responses, which further modulate photonic device capabilities.
如何引用
AMA
Albin Kuriakose, Pankaj Srivastava, G Vijaya Prakash. {"_":"Unusual Nonlinear Optical Absorption Dispersion in a:SiN Aperiodic Photonic Structures.","b":[{"sub":["x"]}]}. ACS applied materials & interfaces. 2026; doi:10.1021/acsami.6c02655.
APA
Albin Kuriakose, Pankaj Srivastava, G Vijaya Prakash (2026). {"_":"Unusual Nonlinear Optical Absorption Dispersion in a:SiN Aperiodic Photonic Structures.","b":[{"sub":["x"]}]}. ACS applied materials & interfaces. https://doi.org/10.1021/acsami.6c02655
GB/T 7714
Albin Kuriakose, Pankaj Srivastava, G Vijaya Prakash. {"_":"Unusual Nonlinear Optical Absorption Dispersion in a:SiN Aperiodic Photonic Structures.","b":[{"sub":["x"]}]}[J]. ACS applied materials & interfaces, 2026 doi:10.1021/acsami.6c02655.
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