Hybrid Plasmon-Mediated Optical Transmission in Separated Metallic Layers with Nanostructures

Abstract

Optical transmission from hybrid surface plasmonpolaritons (SPPs) in separated metallic double layers is investigated. SPPs in metallic double layers have been understood as that they have the external-SPP mode and the internal-SPP mode, existing with these SPP modes decoupled from each other. However, here we propose that such SPPs can be coupled together by theoretical analysis in double metallic flat layers. Moreover, metallic double layers with nanostructures of deep nanodimple arrays can have hybrid SPP modes from interaction between the external-SPP even mode and the internal-SPP odd mode, owing to quasi-localized SPPs at dimple dips. The numerical simulations and experiments show that these hybrid SPP modes produce enhancement of optical transmission.

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“…However, the highest performance of the experimental green OLED comprising an Alq 3 emitting layer (peak emission wavelength ≈ 530 nm) was obtained at the other AgNM period, contrary to expectations. [33][34][35] However, the interaction between separated SPPs is negligible because the optical distance between the AgNM anode and Ag cathode is large enough (the refractive index and thickness of the intermediate dielectric are 1.52-1.8 and 130 nm, respectively). One conceivable reason for this result is a decrease in the resonance wavelength of SPPs on the AgNM and hence a blueshift of the transmittance peak, given that the other SPPs on the adjacent other metal surfaces (i.e., SPPs on the Ag cathode) can affect the primary SPPs (i.e., SPPs on the AgNM anode).…”

“…(In such structures, so-called metal (M)/ dielectric (D)/M/D/M, SPP modes appear as coupled forms by interaction between SPPs on separated metal surfaces.) [33][34][35] However, the interaction between separated SPPs is negligible because the optical distance between the AgNM anode and Ag cathode is large enough (the refractive index and thickness of the intermediate dielectric are 1.52-1.8 and 130 nm, respectively). On the other hand, we presume that the high effi ciency of the AgNM-based OLED at p = 330 nm is mainly caused by signifi cantly suppressed SP loss at the nanostructured Ag cathode surface, rather than variation of the transmittance peak of the AgNM anode.…”