{'fraction_non_alphanumeric': 0.024615384615384615, 'fraction_numerical': 0.02358974358974359, 'mean_word_length': 5.2165605095541405, '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}}
Bifunctional Metasurface for Absorption and Polarization Conversion Based on Photosensitive Semiconductor

In this paper, a novel bifunctional metasurface with absorption and polarization conversion mode based on photosensitive semiconductor is proposed. The two functions of the metasurface can be switched by controlling the state of photosensitive semiconductor Si located at both ends of the wide cross metal resonator. When there is no pump light to illuminate the metasurface, it operates in absorption mode with the absorptivity of near 92.8% and 95.6% at 2.25 THz and 2.75 THz, respectively; while the photosensitive Si is excited by pump light, its operating mode is switched to broadband polarization conversion with the polarization conversion ratio (PCR) of over 90% in the range of 1.32 THz~2.15 THz and the relative bandwidth of 47.8%. In addition, the physical mechanism of the bifunction is explained by analyzing the current and magnetic field distributions.