In this article, a dual‐channel, metasurface‐based frequency‐multiplexed binary amplitude shift keying (ASK) modulator is developed for terahertz applications. The metasurface building block is designed on a gold‐backed, reflective silicon dioxide (SiO 2 ) substrate and consists of one hexagonal and one elliptical graphene monolayer patch. The device operates as a dual‐channel binary‐ASK modulator with two distinct channels at 1.45189 and 1.79571 THz. Both channels exhibit high extinction ratios of at least 17.05 and 10.20 dB, respectively. The device offers excellent modulation depth of at least 83.88% (maximum 98.02%) and 89.76% (maximum 90.45%), and exceptionally low insertion loss with maximum values of 0.757 and 0.282 dB, respectively. The proposed binary‐ASK scheme provides an extremely low bit‐error rate, which is very close to zero for both coherent and noncoherent detection. By leveraging the tunability of graphene, digital data bits are encoded through variation of the chemical potential (CP). A CP value of 0 eV represents the input data bit ‘0’, while a CP value of 1.0 eV represents the input data bit ‘1’. The device demonstrates ultimate suitability for ultra‐high‐speed wireless communication in beyond‐5G and 6G networks, secure wireless links for defense applications, terahertz imaging, and spectroscopic sensing systems.
Mistri et al. (Wed,) studied this question.
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