Spontaneous emission, collective phenomena and the efficiency of plasmon-stimulated photoexcitation

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

Abstract

We find that the spontaneous and collective emissions have a strong influence on the excitation of two-level absorbers (atoms, molecules) interacting in resonance with the plasmonic mode near the metal nanoparticle. The spontaneous and collective emissions limit the absorption enhancement by the plasmonic mode and make the enhancement possible only with a fast, picosecond population relaxation of the upper absorbing states. Conditions for the maximum of plasmon-enhanced absorption in the presence of spontaneous and collective emissions are found. The nonlinearity in the nanoparticle-absorber interaction and in collective emission causes the bistability in the plasmon-enhanced absorption at high external field intensities and the plasmonic mode excitation.

自发辐射、集体现象和等离子体刺激的光激发效率
我们发现,自发发射和集体发射对与金属纳米粒子附近的质子模式产生共振的两级吸收体(原子、分子)的激发有很大影响。自发发射和集体发射限制了质子模式对吸收的增强作用,只有在上层吸收态发生皮秒级的快速种群弛豫时才有可能增强吸收。在存在自发和集体发射的情况下,找到了等离子体增强吸收最大化的条件。纳米粒子-吸收体相互作用和集体发射中的非线性导致了高外场强度和质子模式激发下质子增强吸收的双稳态性。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
审稿时长
62 days
期刊介绍: This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.
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