{'fraction_non_alphanumeric': 0.0249609984399376, 'fraction_numerical': 0.0, 'mean_word_length': 5.484848484848484, '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}}
High-efficiency Dual-band Bifocal Metalens Based on Reflective Metasurface

Achieving wavelength-independent behavior in a single metasurface is of great significance for electromagnetic integrated system. In this work, a novel dual-band meta-atom is proposed for reflecting the incident wave to its cross-polarized component with high efficiencies. Beside the phase modulation, the amplitude can also be tailored independently at two gigahertz frequencies. As a demonstration example, a dual-band bifocal reflective metalens is designed and numerically verified. The full-wave simulation results are in good agreement with the design goals.