Fig. 3.

Tailoring the scattering cross-section in high refractive-index contrast core–shell photonic particles. (A) Calculated $Q_{\text{sca}}$ for a core–shell particle of fixed outer radius 500 nm; core is the polymer (P) PES having radius $r_{\text{c}}$, whereas the shell is the glass (G) As₂S₃ (refractive indices given in text). Wavelength used in the calculations is 532 nm. (B) Schematic of the optical system for dark-field near-field optical scanning microscope (NSOM), which is based on a Nanonics MultiView 4000 NSOM working in standard collection mode. (C) Calculated scattered field intensities from three particle structures corresponding to cases A, B, and C in A. (D) Measured intensity distributions corresponding to those in C.