Optical near-field absorption at a metal tip far from plasmonic resonance

J. Houard; A. Vella; F. Vurpillot; B. Deconihout

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Optical near-field absorption at a metal tip far from plasmonic resonance

机译：远离等离子体共振的金属尖端的光学近场吸收

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We investigate the wavelength and the polarization dependence of the absorption of a subwavelength tip illuminated by an ultrashort laser pulse using laser-assisted atom-probe tomography. We show that it is possible to localize the absorption at the tip apex by choosing the appropriate laser polarization and wavelength even for excitation wavelength far from the plasmonic resonance. This effect can be explained by the diffraction theory of Sommerfeld applied on a tip geometry. Furthermore, numerical calculations are performed on a real sub-wavelength tip to confirm this absorption localization and to explain the role of the polarization and the wavelength.

机译：我们研究了使用激光辅助原子探针层析成像技术的超短激光脉冲照射的亚波长尖端吸收的波长和偏振依赖性。我们表明，即使对于远离等离子共振的激发波长，也可以通过选择合适的激光偏振和波长来将尖端的吸收定位在局部。可以通过将Sommerfeld的衍射理论应用于尖端几何形状来解释这种效果。此外，在实际的亚波长尖端上进行了数值计算，以确认这种吸收定位并解释偏振和波长的作用。

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来源
《Physical review》 |2010年第12期|p.125411.1-125411.5|共5页
作者
J. Houard; A. Vella; F. Vurpillot; B. Deconihout;
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作者单位

Groupe de Physique des Materiaux, UMR CNRS 6634, UFR Sciences Site du Madrillet, Avenue de l'Universite-BP 12, 76801 Saint Etienne Du Rouvray Cedex, France;

rnGroupe de Physique des Materiaux, UMR CNRS 6634, UFR Sciences Site du Madrillet, Avenue de l'Universite-BP 12, 76801 Saint Etienne Du Rouvray Cedex, France;

rnGroupe de Physique des Materiaux, UMR CNRS 6634, UFR Sciences Site du Madrillet, Avenue de l'Universite-BP 12, 76801 Saint Etienne Du Rouvray Cedex, France;

rnGroupe de Physique des Materiaux, UMR CNRS 6634, UFR Sciences Site du Madrillet, Avenue de l'Universite-BP 12, 76801 Saint Etienne Du Rouvray Cedex, France;

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field emission and field-ion microscopy; near-field scanning microscopy and spectroscopy; optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures;

机译：场发射和场离子显微镜;近场扫描显微镜和光谱学;低维;介观和纳米级材料和结构的光学特性;

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Optical near-field absorption at a metal tip far from plasmonic resonance

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