Figure 29.

Electric field intensity ${|E(r,\theta ,\varphi )|}^2$ in a dielectric conical resonator having an opening angle of ${30}^{\circ }$ and a refractive index of $n\gg 1$. “Electric” and “magnetic” resonances are depicted in Figure 28a,b,c,g and Figure 28d,e,f,h, respectively. Vertical distribution of field is determined by dimensionless frequency $m=nkh$, where n, $k=\omega /c$, and h are refractive index, wavevector, and cone height, respectively. Each resonance is labeled by orbital “number’’ l and the azimuthal number m. The low symmetry of the resonator results in a non-integer l, reprinted with permission from [18], the Optical Society (OSA).