An approach has been devised to create a hexagonal pattern of glass-supported gold nanoparticles (AuNPs) with
controllable particle size and inter-particle spacing, by combining the self-assembly of block copolymer micelle-loaded
metal precursors with a seeding growth method. Absorbance spectra as an optical response of the AuNP arrays were
measured to obtain their LSPR peak position (λ<sub>LSPR</sub>). There was a red shift in λ<sub>LSPR</sub>. with increasing cover medium
refractive index for all fabricated and simulated arrays. A comparison between computed and measured λ<sub>LSPR</sub>. for a 33
nm AuNP array suggests that large nanoparticles produced by this fabrication method have ellipsoidal shapes rather than
spherical ones, as in the case of small AuNP arrays.