380
Z. Wang and B. Luk’yanchuk
Fig. 15.3 Demonstration of SRE. a Giant electric field intensity |E| 2 distribution in XZ plane and
b YZ plane, for a linearly incident beam ploarized along x-direction. c Intensity across two hotspots
(Points T, B), measured from top T to bottom B. d The FWHM spot size is 0.22λ (~λ/5) at position
B
elsewhere. It is noted that Haong et al. also reported super-resonance effect using
same experimental parameters as in Fig. 15.1 (a = 2.37 μm, n = 1.46), they found
that a ~0.24λ resolution can be achieved at wavelength 402.292 nm, in excess of
solid immersion resolution limit of λ/(2*1.46) = 0.34λ [43]. We believe SRE is vital
to microsphere super-resolution imaging.
15.2.1.3 Broadband Illumination Effect
In microsphere imaging, a white lighting source (e.g. halogen lamp) is often used.
theoretical analysis of resolution is often carried out by using illumination’s peak
wavelength (e.g. 550 or 600 nm). This neglects the broadband nature of illumination
source. In fact, the application of white light will lead to the simultaneous excitation of
various focusing field distribution across a wide size parameter range. Considering a
Z. Wang and B. Luk’yanchuk
Fig. 15.3 Demonstration of SRE. a Giant electric field intensity |E| 2 distribution in XZ plane and
b YZ plane, for a linearly incident beam ploarized along x-direction. c Intensity across two hotspots
(Points T, B), measured from top T to bottom B. d The FWHM spot size is 0.22λ (~λ/5) at position
B
elsewhere. It is noted that Haong et al. also reported super-resonance effect using
same experimental parameters as in Fig. 15.1 (a = 2.37 μm, n = 1.46), they found
that a ~0.24λ resolution can be achieved at wavelength 402.292 nm, in excess of
solid immersion resolution limit of λ/(2*1.46) = 0.34λ [43]. We believe SRE is vital
to microsphere super-resolution imaging.
15.2.1.3 Broadband Illumination Effect
In microsphere imaging, a white lighting source (e.g. halogen lamp) is often used.
theoretical analysis of resolution is often carried out by using illumination’s peak
wavelength (e.g. 550 or 600 nm). This neglects the broadband nature of illumination
source. In fact, the application of white light will lead to the simultaneous excitation of
various focusing field distribution across a wide size parameter range. Considering a