Fig. 2: Coupling to a surface lattice resonance.
The colors in a–d are consistent, corresponding to the same type of nanoparticle. a The imaginary part of the individual particle polarizability for various nanostructures with increasing resonance wavelength λLSPR, holding both the oscillator strength A0 and the damping term γ fixed. Here λLSPR is tuned from 800 to 1000 nm. b Simulated broadband transmission spectra for gold nanostructure arrays as a function of tuning λLSPR. By tuning the LSPR wavelength, the extinction factor of the SLR is observed to change near λ = 1542 nm. While λLSPR changes dramatically, the SLR wavelength λSLR does not change much. c Zoomed-in plot of the SLR in b. d The Q-factor of the surface lattice resonance as a function of λLSPR for various oscillator strengths A0. The optimal LSPR wavelength for a high-Q SLR changes as a function of A0. The oscillator strength A0 increases from 3.98 × 10−7 to 4.77 × 10−7 m3/s, roughly corresponding to a 20% increase in the particle volume. The squares indicate the Q values extracted from the curves in c.
