Plasmon-assisted two-photon absorption in a semiconductor quantum dot–metallic nanoshell composite

Abstract

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 twophoton absorption of the composite, emerging from the coupling between both nanoparticles, are bistability and self-oscillations.

Study of two-photon absorption and optical limiting

“…In 2020 Nugroho et al realized that for many applications potential can be hold by two photon absorption and predicted that two-photon absorption occur coherent and incoherent biexcitation transition [3]. Stephen A. Slattery and D. N. Nikogasyan described two photon absorption properties of some common UV materials like fused silica, quartz, CaF2, and BaF2, using the fifth harmonic of Nd-glass laser radiation at 211nm.…”

Linear and Nonlinear Optical Properties of a Doubly Clamped Suspended Monolayer Graphene Nanoribbon Nanoresonator

“…The optical response of hybrid systems that make use of the interaction between different excitations, such as, for example, excitons from semiconductor quantum dots or molecules and plasmons from metallic nanoparticles, have attracted the interest of recent studies due to the enhanced nonlinear and quantum optical effects that the hybrid systems may offer, as compared to their uncoupled constituents [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. Another important category of hybrid systems investigated for their enhanced nonlinear optical response are those emerging due to the coupling between excitons in quantum dots and phonons in nanoresonators [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”

Effective Control of the Optical Bistability of a Three-Level Quantum Emitter near a Nanostructured Plasmonic Metasurface

“…Various phenomena have been studied in such media, including the manipulation of spontaneous emission [13][14][15][16], Fano effects in energy absorption [17][18][19][20], slow light and optical transparency [21][22][23], enhancement of the refractive index [24], modification and enhancement of the Kerr nonlinearity [25][26][27][28], four-wave-mixing [29,30], inversionless gain [31][32][33][34][35][36], OB or optical multistability (OM) [37][38][39][40][41][42][43][44][45][46][47][48][49], and many others [50][51][52]. The contemporary fabrication methods [53][54][55][56] for realizing plasmonic nanostructures incorporating quantum emitters [57] enable the experimental verification of the above phenomena.…”