Figure 2.

Optical properties of polycrystalline silicon colloids. Optical transmittance (black curves) and the Mie theory fit (red curves) of single silicon colloids of diameter Φ = 1,885 (a) and Φ = 1,050 nm (b). The dips of transmittance correspond to WGM. They are indicated under their corresponding dip in (a) by labels ‘b’ and ‘a’ for transversal electric and magnetic modes, respectively. The electric field intensity distribution is shown for modes (from left to right) a₂₁, a₃₁, and b₄₁ in (b) (reprinted with the permission of [18]).