[vc_empty_space][vc_empty_space]
Plasmon-assisted two-photon absorption in a semiconductor quantum dot-metallic nanoshell composite
Nugroho B.S.a, Iskandar A.A.b, Malyshev V.A.c,d, Knoester J.c
a Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Tanjungpura, Pontianak, 78115, Indonesia
b Physics of Magnetism and Photonics Research Group, Institut Teknologi Bandung, Bandung, 40132, Indonesia
c University of Groningen, Zernike Institute for Advanced Materials, Groningen, 9747 AG, Netherlands
d Department of Theoretical Physics and Astronomy, Herzen State Pedagogical University, St. Petersburg, 191186, Russian Federation
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2020 American Physical Society.Two-photon absorption holds potential for many practical applications. We theoretically investigate the onset of this phenomenon in a semiconductor quantum dot-metallic nanoshell composite subjected to a resonant CW excitation. Two-photon absorption in this system may occur in two ways: incoherent-due to a consecutive ground-to-one-exciton-to-biexciton transition-and coherent-due to a coherent two-photon process, involving the direct ground-to-biexciton transition in the quantum dot. The presence of the nanoshell nearby the quantum dot gives rise to two principal effects: (i) renormalization of the applied field amplitude and (ii) renormalization of the resonance frequencies and radiation relaxation rates of the quantum dot, both depending on the quantum dot level populations. We show that in the perturbation regime, when the excitonic levels are only slightly populated, each of these factors may give rise to either suppression or enhancement of the two-photon absorption. The complicated interplay of the two determines the final effect. Beyond the perturbation regime, it is found that the two-photon absorption experiences a drastic enhancement, which occurs independently of the type of excitation, either into the one-exciton resonance or into the two-photon resonance. Other characteristic features of the two-photon absorption of the composite, emerging from the coupling between both nanoparticles, are bistability and self-oscillations.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Exciton resonances,Excitonic levels,Level populations,Metallic nanoshell,Resonance frequencies,Self-oscillations,Two photon absorption,Two-photon resonance[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]This work was supported by the Directorate General of Higher Education, Ministry of Research, Technology, and Higher Education, Republic of Indonesia (Contract No 101/SP2H/LT/DPRM/2019). B.S.N. acknowledges the University of Groningen for hospitality.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1103/PhysRevB.102.045405[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]