Fig 1.
Calculated absorption spectrum.
For the sharp-corner rectangular gold nanobar with different thickness (A) For longitudinal polarization and (B) for transverse polarization. In both cases light is normally incident. Insets show to top view of the nanobar with polarization direction.
Fig 2.
Calculated average enhancement spectrum.
Spectrum was calculated in the integrated volume of the sharp-corner rectangular gold nanobar for normal light incidence in the effective medium (neff = 1.25) with different thickness for (A) longitudinal polarization (B) transverse polarization.
Fig 3.
Electromagnetic field distributions for sharp-corner nanobar.
(A) Field distribution for top, middle, and bottom surfaces at resonance wavelengths for sharp-corner Au nanobars of length 100 nm and width 60 nm for different thickness when polarization is aligned along the long axis and normal incidence. (B) Schematic of sharp-corner nanobar.
Fig 4.
Electromagnetic field distributions for round-corner nanobar.
(A) Field distribution for top, middle and bottom surfaces at resonance wavelengths for round-corner Au nanobars of length 100 nm and width 60 nm for different thickness when polarization along the long axis and normal incidence. (B) Schematic of round-corner nanobar.
Fig 5.
Dependance of maximum enhancement and peak resonance wavelength on thickness.
(A) Normalized maximum enhancement [arb. unit] at resonant incident wavelength as a function of thickness for sharp-corner and round-corner nanobars for longitudinal and transverse polarization (B) Peak resonance wavelength as a function of thickness for both longitudinal and transverse polarization.
Fig 6.
At peak resonance wavelength when the thickness is (a) 8 nm (b) 20 nm and (c) 50 nm.
Fig 7.
Resonance energy and thickness dependend FWHM.
(A) Full width half maximum as a function of resonance energy (B) Full width half maximum as a function of thickness, where light incident normally.