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Order-of-magnitude enhancement of intersubband photoresponse in a plasmonic quantum dot system

机译:等离子体量子点系统中子带间光响应的量级增强

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摘要

The unprecedented ability of metallic subwavelength structures to confine and concentrate light into subwavelength spaces has led to new physics and exploration of novel devices. In this Letter, we demonstrate a 20 times enhancement of intersubband photoresponse in a InAs quantum dot (QD) system due to evanescently coupled plasmonic field. The resulting enhancement is accompanied by significant narrowing of photoresponse linewidth. The strong enhancement is attributed to efficient coupling of incident field to surface modes and to QDs, the presence of polarization-dependent absorption from QDs, and a fairly strong plasmon-QD interaction.
机译:金属亚波长结构将光限制和聚集到亚波长空间中的空前能力导致了新的物理学和新设备的探索。在这封信中,我们证明了由于e逝耦合等离子体场,InAs量子点(QD)系统中子带间光响应增强了20倍。所得到的增强伴随着光响应线宽的显着变窄。强烈的增强归因于入射场与表面模和量子点的有效耦合,量子点的偏振相关吸收的存在以及相当强的等离激元-量子点相互作用。

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