Imaging Infrared Plasmon Hybridization in Doped Semiconductor Nanocrystal Dimers
Imaging Infrared Plasmon Hybridization in Doped Semiconductor Nanocrystal Dimers
复制标题
掺杂半导体纳米晶体二聚体中的红外等离激元杂交成像
DOI：
10.1021/acs.jpclett.1c02741
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Camden, Jon P.
中科院分区：
文献类型：
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作者：
Olafsson, Agust;Khorasani, Siamak;Busche, Jacob A.;Araujo, Jose J.;Idrobo, Juan Carlos;Gamelin, Daniel R.;Masiello, David J.;Camden, Jon P.
载流子掺杂的半导体纳米晶体（nc）在频率上提供了比传统等离子体纳米粒子更强的等离子体响应。与贵金属类似物一样，这些新兴材料可以利用自由空间辐射，并将其限制在纳米级，但共振频率是红外的，并且可以通过载流子浓度在光谱上进行调节。在这项工作中，我们结合单色STEM-EELS和理论建模来研究胶体氧化铟锡（ITO） NC对形成杂化等离子体模式的能力，为影响红外等离子体光谱提供了额外的途径。这些结果表明，ITO纳米管可能具有比预期更大的耦合强度，强调了它们在近场增强和红外区域共振能量转移方面的潜力。
Carrier-doped semiconductor nanocrystals (NCs) offer strong plasmonic responses at frequencies beyond those accessible by conventional plasmonic nanoparticles. Like their noble metal analogues, these emerging materials can harness free space radiation and confine it to the nanoscale but at resonance frequencies that are natively infrared and spectrally tunable by carrier concentration. In this work we combine monochromated STEM-EELS and theoretical modeling to investigate the capability of colloidal indium tin oxide (ITO) NC pairs to form hybridized plasmon modes, providing an additional route to influence the IR plasmon spectrum. These results demonstrate that ITO NCs may have greater coupling strength than expected, emphasizing their potential for near-field enhancement and resonant energy transfer in the IR region.