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首页> 外文期刊>Applied optics >Phase resonances induced by a subwavelength particle near a surface with two cavities
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Phase resonances induced by a subwavelength particle near a surface with two cavities

机译：具有两个空腔的表面附近的亚波长粒子引起的相共振

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摘要

It is well known that finite groove gratings with subwavelength features exhibit phase resonances, which are associated with a particular distribution of the magnetic field phase within the cavities and are characterized by a significant enhancement of the internal field. For a flat surface with identical grooves under symmetrical conditions of incidence, it was shown that a minimum of three cavities is required to excite a phase resonance. In this paper we show that by approaching a particle to the surface, this requirement is removed and the particle enables the excitation of phase resonances even in a system of two identical cavities under normal incidence. The influence of the position and the radius of the particle in the reflected far field response, as well as in the near and internal field, is analyzed. The possibility of exciting phase resonances in this system opens up new means for the design of sensing devices. (C) 2015 Optical Society of America
机译：众所周知，具有亚波长特征的有限凹槽光栅表现出相位共振，该共振与腔内磁场相位的特定分布相关，并且特征在于内部场的显着增强。对于在对称入射条件下具有相同凹槽的平坦表面，显示出至少需要三个空腔来激发相共振。在本文中，我们表明，通过使粒子靠近表面，可以消除此要求，并且即使在法向入射下具有两个相同空腔的系统中，粒子也可以激发相共振。分析了粒子的位置和半径在反射的远场响应以及近场和内部场中的影响。该系统中激发相谐振的可能性为传感设备的设计开辟了新的手段。 （C）2015年美国眼镜学会

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