分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： Near-field radiative heat transfer (NFRHT) has received growing attention because of its high intensity far beyond the Planck's black-body limit. Insertion of a third object in proximity of the two particles can significantly influence and manipulate its NFRHT. However, for the system composed of many particles, effect of the many-body interaction (MBI) on the NFRHT between arbitrary two particles of interest caused by the neighboring particles lying in proximity is still unclear (namely, 'proximate' MBI), which is the focus of this work. Three typical kinds of the proximate ensemble: one-dimensional particle chain, two-dimensional square-lattice particle plane and particle grating, are considered by using the many-body radiative heat transfer theory. When increasing the proximate particle size, the effect of many-body interaction on NFRHT will experience a radical change from inhibition to enhancement. It is worth mentioning that the unique enhancement on NFRHT caused by the proximate particle chain is different from the reported inhibition effect. The proximate particle polarizability increases when increasing the particle radius, which will affect the interaction between the proximate particles and the main particle (even when the main particle size does not change at all), and then results in enhancement of heat transfer between the main particles. As for the symmetry breaking effect on the NFRHT, when twisting the proximate particle ensemble, the proximate MBI accounts for a smooth and non-oscillated twisting angle dependence of NFRHT, different from the oscillation phenomenon of NFRHT for particle gratings mediated by the intra-ensemble and inter-ensemble MBI. This work will deepen the understanding of the NFRHT in dense particulate systems and guide applications for thermal management in micro-/nano-electromechanical devices.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： Extinction of small metallic spheres has been well understood through the classical Mie theory when the host medium is dispersive and transparent. However, the role of host dissipation on the particulate extinction remains a competition between the enhancing and reducing effects on the localized surface plasmonic resonance (LSPR). Here, using a generalized Mie theory, we elaborate on the specific influence mechanisms of host dissipation on the extinction efficiency factors of a plasmonic nanosphere. To this end, we isolate the dissipative effects by comparing the dispersive and dissipative host with its transparent counterpart. As a result, we identify the damping effects of host dissipation on the LSPR including the resonance widening and amplitude reducing. The resonance positions are shifted by host dissipation, which cannot be predicted by the classical Fr\"ohlich condition. Finally, we demonstrate that a wide-band extinction enhancement due to host dissipation can be realized away from the positions of LSPR.
点击量
待评议
点击量
下载量
评论
