Plasmonic gap-mode nanocavities with metallic mirrors in high-index cladding

Abstract

We theoretically analyze plasmonic gap-mode nanocavities covered by a thick cladding layer at telecommunication wavelengths. In the presence of high-index cladding materials such as semiconductors, the first-order hybrid gap mode becomes more promising for lasing than the fundamental one. Still, the significant mirror loss remains the main challenge to lasing. Using silver coatings within a decent thickness range at two end facets, we show that the reflectivity is substantially enhanced above 95 %. At a coating thickness of 50 nm and cavity length of 1.51 μm, the quality factor is about 150, and the threshold gain is lower than 1500 cm(-1).

Full-Spectrum Analysis of Perovskite-Based Surface Plasmon Nanolasers

“…As illustrated in Fig. 3, we determined the modal loss and confinement factor [24] of the guided hybrid plasmonic modes for the waveguide-a mixed perovskite NW, MAPb(Br x Cl 1-x ) 3 and MAPb(I y Br 1-y ) 3 of doping composition x and y from 0 to 1 on the SiO 2 /Ag, SiO 2 /Al or SiO 2 /Au plate of gap thickness t g at their corresponding emission wavelengths. We determined the guided modes corresponding to a large range of emitting wavelengths, from 425 to 555 nm for the perovskite MAPb(Br x Cl 1-x ) 3 and from 555 to 800 nm for MAPb(I y Br 1-y ) 3 .…”

“…We evaluated transparency threshold gains by using the confinement factor and modal loss of each WG for comparing resonance properties in the nanocavities of various metals and gap thicknesses. The transparency threshold is defined as the ratio of modal loss over the confinement factor [24]. As depicted in Fig.…”

“…Various plasmonic NW cavities have been investigated recently [19][20][21][22][23]. Cavities in a metal-insulator-semiconductor scheme are especially promising for sustaining hybrid plasmonic gap modes [24][25][26][27][28]. Therefore, we placed samples of doped or pure perovskite NWs on insulator-coated metallic plates to form plasmonic Fabry-Perot cavities.…”

Proximity correction and resolution enhancement of plasmonic lens lithography far beyond the near field diffraction limit

“…15 Plasmonic imaging lithography based on superlens was demonstrated with a silver lm positioned between mask and resist, with a half-pitch resolution below 60 nm. [16][17][18] More recently, various plasmonic lens lithography were proposed for the improvement of resolution, aspect prole and imaging contrast, by using smooth superlens, 19-21 metal reector cladding, [22][23][24] plasmonic cavity lens etc., 25,26 providing an efficient way for the fabrication of various nanostructures. [27][28][29] Plasmonic cavity lens even has achieved resolution up to a half-pitch of 22 nm in experiment.…”

Coupled nanowire-based hybrid plasmonic nanocavities on thin substrates

“…Except for the analysis of modal characteristics by two-dimensional (2D) finite-element method (FEM) [ 17 , 18 ], we utilize 3D FEM to solve for the modal volume V m and reflection field pattern. The orthogonality theorem of waveguide modes is applied to extract the modal reflectivity R [ 19 ]. We also estimate the required cavity length L , quality factor Q FP , and threshold gain g th necessary for the lasing action at the target wavelength of 450 nm.…”