Figure 3. Performance of gold surface holographic light sources.

(a) Emission intensity as a function of polar angle θ (integrated over all azimuthal angles) in 40 nm wavelength bands centred at 600, 700, 800 and 900 nm, for a 30 μm × 30 μm pattern engineered for 800 nm emission at θ=30° (electron beam current=6.1–6.3 nA; integration time=30 s). (b) Peak intensity and 3 dB full-width half-maximum spot size of 800±20 nm light emission (evaluated at the brightest pixel and as solid angle around said pixel respectively) as functions of the in-plane dimensions of the holographic structure in microns (beam current=5.0–5.2 nA; integration time=30 s; dashed trend lines are exponential curves with a growth/decay constant of 20 μm; Error bars for intensity are evaluated as the difference between the peak pixel intensity and the peak of a Gaussian fit to the polar cross-section through that pixel; and for spot size by including ±1 pixel either side of the 3 dB boundary, weighted for relative brightness, in the evaluation of solid angle). Sections of angular emission intensity distributions are shown inset for holograms with centre-edge distances of 5, 15 and 25 μm (polar and azimuthal grids are in 15° and 30° steps respectively).