[(a) and (b)] Schematics of the periodic and random arrays of slits of width , period , and thickness , respectively. The silt positions of the random arrays of slits are randomized in the frozen-phonon fashion. [(c) and (d)] Microscopic images of the periodic and random arrays of thick slits, respectively.
[(a), (c), and (e)] Transmission amplitude spectra, at normal incidence, calculated using single-slit approximation method for the samples with the thicknesses of , , and , respectively. Arrows represent the peak positions of first Fabry–Perot-type mode. [(b), (d), and (f)] Measured angle-dependent transmission amplitude spectra for the samples with the thicknesses of , , and , respectively.
[(a), (c), and (e)] Measured transmission amplitude spectra, at normal incidence, for three types of the samples such as: (a) periodic arrays of slits, (c) Random Type I, and (e) Random Type II. Red lines in (a) and (e) represent the transmission amplitude spectra calculated in the case of the periodic arrays of slits and obtained using single-slit approximation method, respectively. These samples have same areal sample coverage of 0.2 and same thickness of . The randomization of the slit structures is based on the different frozen-phonon fashion. The spectral positions of the zeroth, first, and second Fabry–Perot-type mode are marked by A, B, and C, respectively. [(b), (d), and (f)] Relative phase changes in radians at normal incidence in the samples corresponding to [(a), (c), and (e)], respectively.
The enhancement factors obtained using the areal sample coverage at three fundamental Fabry–Perot-type modes of: periodic arrays of slits theoretically (black squares) and experimentally (red circles); Random Type I (blue triangles); and Random Type II (inverted cyan triangles).
Normalized angle-dependent transmission amplitudes for three types of the samples such as: (a) periodic arrays of slits; (b) Random Type I; and (c) Random Type II.
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