Light transmission along dispersive plasmonic gap and its subwavelength guidance characteristics

Abstract

Light transmission along dispersive plasmonic gap with varied gap widths and its subwavelength guidance characteristics are numerically investigated over a wide frequency range. Mode numbers for each guided modes of the dispersive plasmonic gaps are properly assigned in order to be in consistency with the parallel plate waveguide composed of the perfect electric conductor. Overall and salient features of the role of the gap widths on the guided propagation characteristics are clearly understood by investigating several dispersion curves of varied gap widths. Cutoff frequency downshifts of the dispersive plasmonic gap compared with the perfect electric conductor based parallel plate waveguides are also observed. Finally, surface plasmon polariton modes having subwavelength guidance capability are described in more detail, which are directly governed by the plasmonic property of the metals. The results are expected to be utilized in designing various potential subwavelength nanophotonic devices.

Silicon-Based Plasmonics for On-Chip Photonics

“…Similar to conventional optical interconnects, the core dimensions determine the allowed propagating modes. If the core thickness t exceeds approximately one half the optical wavelength, these MIM waveguides will be predominately characterized by "photonic" modes, which resemble the modes of a parallel-plate microwave waveguide [40]. As seen in Fig.…”

[INVITED] Epsilon-near-zero metalenses operating in the visible

“…As it is well known, a plasmonic parallel plate waveguide can support two types of modes: 21 surface plasmon modes (SPP) where the propagation constant is larger than the wavenumber in freespace ( > k o ) [also known as slow wave modes since they fall beyond the cone of light] and the parallel plates waveguide modes with the complementary performance ( < k o ) [also named as fast wave modes]. We are interested in the second group of modes since it is not possible to use the SPP modes to artificially create an ENZ medium; SPP modes require a negative permittivity in order to exist.…”

Classical Analog of Electromagnetically Induced Transparency in the Visible Range With Ultra-Compact Plasmonic Micro-Ring Resonators

“…For the dielectric micro-ring resonator approach, the device size cannot be too small not only because the waveguide bending loss quickly becomes too large when the device radius is too small [13]- [15], but also because the waveguide mode size eventually gets broadened when the waveguide size is much decreased [16]. On the other hand, the surface plasmon polaritons (SPPs), which are the bound nonradiative surface modes that propagate along the metal-dielectric interfaces, have attracted a lot of research interest due to their novel field confinement down to the subwavelength level [17], [18]. Many plasmonic devices, such as the channel drop filters [19], [20], the ring resonators [21]- [23], and the EIT-like devices [24], [25] have been proposed to reduce the device size.…”