{'fraction_non_alphanumeric': 0.02351313969571231, 'fraction_numerical': 0.009681881051175657, 'mean_word_length': 5.241379310344827, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Near-field optical characteristics of sub-wavelength grating irradiated by ultra-short optical pulse

We present a method for near-field analysis of ultra-short optical pulse propagation in the sub-wavelength grating based on the integration of Fourier spectrum decomposition and Fourier modal method. By using this method, near-field optical distribution within a high-efficiency reflective grating based on total internal reflection (TIR) is calculated as the irradiation source is a 200fs optical pulse with central wavelength of 1053nm. Electric field enhancement within the TIR grating is analyzed for both TE- and TM-polarized pulses. Methods of controlling the peak intensity in the grating ridge are also presented.