Generation of a Conjoint Surface Plasmon by an Infrared Nano-Antenna Array
Generation of a Conjoint Surface Plasmon by an Infrared Nano-Antenna Array
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DOI：
10.1002/adpr.202000003
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发表时间：
2021-02-01
期刊：
影响因子：
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通讯作者：
Diego Ania-Castanon, Juan
中科院分区：
文献类型：
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作者：
Allsop, Thomas;Mou, Chengbo;Diego Ania-Castanon, Juan
由光场激发的局域表面等离子体(LSP)由于能够探测超小的环境折射率变化而具有许多潜在的应用。目前使用光刻表面纳米图案化的方法已经产生了有限的传播和相互作用长度的LSP，这意味着实际应用仍然具有挑战性。本文描述了一种新的全光学方法，利用直写光化学光刻技术，通过精心制作的低维纳米结构材料来产生LSP。结果表明，所得到的局域SP阵列通过耦合的逝去场结合或“连接”具有前所未有的大相互作用长度，从而产生了优异的光谱灵敏度，比其他文献中引用的结果高出几个数量级，在水相区域达到6×10(3)nmRIU(-1)，在气态区域达到10(4)nmRIU(-1)。数值模拟表明，这种设计的等离子体激元平台能够产生10(5)-10(6)nmRIU(-1)的灵敏度。这项研究的结果表明，一种独特的联合SP工作模式将对单分子动力学、药物传递系统等感兴趣的领域产生重大影响。
Localized surface plasmons (LSP) excited by optical fields have many potential applications resulting from their ability in detecting ultra-small, ambient refractive index change. Current methods using surface nano-patterning by means of lithography have given rise to LSP of limited propagation and interaction lengths, meaning that practical applications remain challenging. This article describes a new all-optical method of generating LSP by means of a carefully fabricated low-dimensional nano-structured material using a direct-write photochemical lithography. It is shown that the resulting array of localized SPs combine or "Conjoin" to have an unprecedented large interaction length, via coupled evanescent fields, giving rise to superior spectral sensitivities; several orders of magnitude better than those quoted elsewhere and reaching 6x10(3)nmRIU(-1) in the aqueous regime and 10(4)nmRIU(-1) in the gaseous regime. Numerical modeling is performed that shows this design of plasmonic platform is capable of producing sensitivities of 10(5)-10(6)nmRIU(-1). It is believed the results achieved in this investigation show that a unique conjoint SP operational mode will significantly impact areas of interest, such as single molecular dynamics, drug delivery systems, etc.