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不同宽度双狭缝复合光栅多频相位共振特性

Properties of Multi-Frequency Phase Resonance in Double-Slit Compound Gratings with Different Slit Widths

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摘要

采用时域有限差分法研究了基于不同宽度的双狭缝复合光栅的光学传输特性。结果表明:相位共振劈裂现象可以通过调制狭缝宽度实现,而且可以实现在多个频率同时调制,所有模式都出现了明显尖锐的相位共振劈裂,其中一些劈裂谷底几乎趋近于0。其次,基于电磁场分布、法布里-珀罗共振和相位共振机制对产生的机理进行了定性的描述和解释。实现了光从两个狭缝中任意一个狭缝通过的可能,也可以选择劈裂低谷来实现禁带的设计。这些结果可以被用来设计光通道选择器、频率选择器、滤波器和光开关。相比于传统的复合光栅,基于两个不同宽度狭缝的复合光栅具有结构简单,材料单一,易于设计、分析和实现等优势。

Abstract

Transmission properties of light through a double-slit compound grating with different slit widths are investigated with the finite-difference time-domain (FDTD) method. The results show that phase resonance (PR) splitting can be achieved with the slit widths modulation, and it can be simultaneously modulated at multiple frequencies. All modes have sharp PR splittings, and the values of some valleys are almost zero. Secondly, based on the electromagnetic field distribution, Fabry-Perot resonant and phase resonant mechanism, the physical origins of the observations have been qualitatively described and explained. In addition, we can realize the control of light spreading through any slit in two slits, and also achieve the design of bandgap by splitting valley. These results can be used to design optical channel selector, frequency selector, filter and optical switch. Compared with the conventional compound gratings, this double-slit grating with different slit widths has obvious advantages, such as simple structure, single material, and easy realization, design and analysis.

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中图分类号:O439

DOI:10.3788/aos201838.1024001

所属栏目:表面光学

基金项目:国家自然科学基金(61764005)、国家留学基金委青年骨干教师出国研修项目(201709795001)、江西省教育厅科研项目(GJJ160532)、江西省研究生教改项目(JXYJG-2017-080)、江西省“百人远航工程”人才项目(2017-91)、江西省青年教师出国访学项目(2016-109)

收稿日期:2018-04-09

修改稿日期:2018-04-25

网络出版日期:2018-05-08

作者单位    点击查看

周凤麒:华东交通大学理学院, 江西 南昌330013俄亥俄州立大学生物医疗信息中心, 美国 俄亥俄州 哥伦布 43210
高恩多:华东交通大学理学院, 江西 南昌330013
张镇斌:华东交通大学理学院, 江西 南昌330013
刘志敏:华东交通大学理学院, 江西 南昌330013俄亥俄州立大学材料科学与工程学院, 美国 俄亥俄州 哥伦布 43210

联系人作者:刘志敏(liuzhimin2006@163.com)

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引用该论文

Zhou Fengqi,Gao Enduo,Zhang Zhenbin,Liu Zhimin. Properties of Multi-Frequency Phase Resonance in Double-Slit Compound Gratings with Different Slit Widths[J]. Acta Optica Sinica, 2018, 38(10): 1024001

周凤麒,高恩多,张镇斌,刘志敏. 不同宽度双狭缝复合光栅多频相位共振特性[J]. 光学学报, 2018, 38(10): 1024001

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