Fig. 1. (a) Scanning electron microscope image of a suspended 1D nanobeam PhC cavity. (b) Zoom-in side view image of the PhC cavity, where t_h is the slab thickness. (c) Zoom-in top view image of the 1D-PhC cavity. The nominal unit cell is parameterized by a (lattice constant, hole to hole distance), w (beam width), h_x (air hole length), and h_y(air hole width).

Fig. 2. (a) Experimentally measured PL spectrum (blue line) and 3D-FDTD simulation spectrum (purple line) from a PhC with a lattice constant of 290 nm. Resonance peaks in the simulated spectrum show a good consistence with the experimental results at room temperature, especially the TE-like polarized modes. (b)–(d) 3D finite-element-method (FEM) simulated optical profiles (E_y component) of the (b) TE₀, (c) TE₁, and (d) TE₂ modes.

Fig. 3. (a) PL spectra of 1D-PhC cavities with lattice constants of 270 nm and 290 nm. The fundamental TE-like modes are located at 753.8 nm and 825.4 nm, respectively. (b), (c) Normalized PL spectra and theoretical fitting (red lines) of the TE₀ modes for cavities with lattice constants of (b) 270 nm and (c) 290 nm.

Fig. 4. (a) Measured PL spectra as a function of the excitation power. (b) Resonance shift of the TE-like modes (rectangle for TE₀, circle for TE₂, triangle for TE₃) as a function of excitation power.