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<p>Symmetry breaking provides a route to manipulate metallic surface plasmon to realize special emission properties at subwavelength scale. Here, we propose a notched gold nanodisk based plasmonic Fabry–Perot cavity and investigate spaser characteristics of the cavity. It is found that the scattered power flow of the anti-bonding plasmon mode propagates unidirectionally, and the emission angle can be further restricted for the cavity with gain. The underlying physics of the behavior is interpreted in terms of coherent interference of dipolar plasmon modes and further evidenced by the near-field electric distribution. Our results may contribute to the design of unidirectional emitters for efficient coupling of optical signals into planar devices.</p>

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Directional Emission from Symmetry-Broken Metal Nanodisk Cavity

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Yuxing Wang,
  • Weiwei Dong,
  • Meng Zhao,
  • Shang Xiang,
  • Xiaoyu Wang,
  • Guoqiu Yuan,
  • Meng Wang,
  • Min Cao

摘要

Symmetry breaking provides a route to manipulate metallic surface plasmon to realize special emission properties at subwavelength scale. Here, we propose a notched gold nanodisk based plasmonic Fabry–Perot cavity and investigate spaser characteristics of the cavity. It is found that the scattered power flow of the anti-bonding plasmon mode propagates unidirectionally, and the emission angle can be further restricted for the cavity with gain. The underlying physics of the behavior is interpreted in terms of coherent interference of dipolar plasmon modes and further evidenced by the near-field electric distribution. Our results may contribute to the design of unidirectional emitters for efficient coupling of optical signals into planar devices.