Figure 5
From: Tailoring topological edge states with photonic crystal nanobeam cavities
Tailoring TESs with different axial shift of the SSH nanobeams. (a) Spectra of the edge and middle nanobeams of the SSH structure when \(d_{2 } = 1.71\;\upmu{\text{m}}\), showing a merged peak at \(\lambda_{2 } = 1.624\;\upmu{\text{m}}\) and suggesting the edge mode not being allowed at this wavelength. (b) The corresponding electric field distribution |E| at the spectra peak wavelengths \(\lambda_{1}\) (left) and \(\lambda_{2}\) (right), respectively. (c) Spectra of the edge and middle nanobeams of the SSH structure when \(d_{2 } = 4.5\;\upmu{\text{m}}\), showing merged peaks at both \(\lambda_{1 } = 1.546\;\upmu{\text{m}}\) and \(\lambda_{2 } = 1.624\;\upmu{\text{m}}\) and indicating non generation any edge mode. (d) The corresponding field distribution \(H_{z}\) at the two wavelengths. The other geometrical parameters of the nanobeams are the same as those in Fig. 4.
