| 超越SNOM探针通光孔径尺寸的金属纳米间隙超分辨测量 |
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| 引用本文： | 武娜娜,钟莹,刘海涛. 超越SNOM探针通光孔径尺寸的金属纳米间隙超分辨测量[J]. 光子学报, 2020, 49(5): 63-70. DOI: 10.3788/gzxb20204905.0512001 |
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| 作者姓名： | 武娜娜 钟莹 刘海涛 |
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| 作者单位： | 南开大学 电子信息与光学工程学院 现代光学研究所,天津市微尺度光学信息技术科学重点实验室,天津 300350,天津大学 精密仪器与光电子工程学院,精密测试技术及仪器国家重点实验室,天津 300072,南开大学 电子信息与光学工程学院 现代光学研究所,天津市微尺度光学信息技术科学重点实验室,天津 300350 |
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| 基金项目： | 国家自然科学基金;高等学校学科创新引智计划(111计划) |
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| 摘 要： | 采用电磁场有限元方法,数值模拟了孔径型扫描近场光学显微镜(aperture Scanning Near-field Optical Microscopy,a-SNOM)在照明模式下的工作过程.针对金偶极天线结构,改变天线长度和纳米间隙尺寸,计算了a-SNOM探针孔径的远场辐射速率随探针端面中心坐标变化的扫描曲线,实现了超越a-SNOM探针通光孔径尺寸的天线金属纳米间隙的超分辨测量,对于100nm通光孔径的探针,可分辨最小尺寸为10nm(0.016倍波长)的金属间隙.通过对比金属和介质偶极天线的a-SNOM探针远场辐射速率测量的计算结果,表明天线金属纳米间隙的超分辨测量的实现是由于金属间隙表面等离激元的激发.
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| 关 键 词： | 纳米光子学 偶极天线 扫描近场光学显微镜 分辨率 探针 间隙表面等离激元 远场辐射速率 |
Superresolving Measurement of the Metallic Nanogap beyond the Aperture Size of the SNOM Probe |
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| WU Na-na,ZHONG Ying,LIU Hai-tao. Superresolving Measurement of the Metallic Nanogap beyond the Aperture Size of the SNOM Probe[J]. Acta Photonica Sinica, 2020, 49(5): 63-70. DOI: 10.3788/gzxb20204905.0512001 |
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| Authors: | WU Na-na ZHONG Ying LIU Hai-tao |
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| Affiliation: | (Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Institute of Modern Optics,College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China;State Key Laboratory of Precision Measurement Technology and Instruments,School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China) |
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| Abstract: | The working process of aperture Scanning Near-Field Optical Microscopy(a-SNOM)under the illumination mode is simulated by using the finite element method of electromagnetic field.With changing the length and nanogap size of the optical resonant dipole antenna,the scanning curves of the radiative emission rate as a function of the central coordinate of the a-SNOM probe end surface are calculated.A superresolving measurement of the metallic nano-gap of the antenna beyond the aperture size of the aSNOM probe is realized.For the a-SNOM probe with an aperture size of 100 nm,the smallest size of the antenna nanogap that can be resolved is 10 nm(0.016 times of the wavelength).By comparing the calculated results of the measured radiative emission rate of the a-SNOM probe for the metal and the dielectric dipole antennas,it is shown that the realization of the superresolving measurement of the metallic nanogap is due to the excitation of the gap surface plasmon polariton. |
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| Keywords: | Nanophotonics Dipole antenna Scanning near-field optical microscope Resolution Probe Gap surface plasmon polariton Radiative emission rate |
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