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The metasurface is a functional film device based on a subwavelength structure, which has a strong light field control ability and has the advantages of ultrathin, low loss, and easy manufacturing. However, realizing a multifunctional metasurface, yet simple enough to design, manufacture, and thin is still a challenge. In this article, we propose a novel metasurface with negligible thickness as a beam splitter, which can achieve half transmission and half reflection of the incident wave at the same frequency. It also controls the polarization of circularly polarized electromagnetic (EM) waves in the transmission mode. A broadband operation can be achieved based on the geometric phase theory, and the phase control can be achieved by azimuth rotation of the structure. The numerical results of the metasurface are in good agreement with the experimental results in the measured frequency range. The ultrathin multifunctional metasurface realized by the geometric phase principle provides an important stepping stone for simple optical devices and can be extended to a higher frequency range. [ABSTRACT FROM AUTHOR]

This paper proposes a toroidal plasmons resonator composed of a slotted circle and a ring fed by a microstrip line. Multi-modes Mie resonances are well excited by the feed of the microstrip line. A toroidal magnetic field is demonstrated and analyzed by CST simulation at 14.318 GHz. The higher-order resonance shows higher sensitivity for permittivity sensing. By reconstructing the structure, the excited octupole has a high sensitivity of 3.68 GHz/RIU and quality factors of 340.6 with a ${Q}$ -factor of 340.6. The high sensitivity, high Q-factor, and compact size make it a good choice for sensing applications. [ABSTRACT FROM AUTHOR]

A microelectromechanical systems (MEMS) low-g inertial switch is typically used for linearly increased/decreased acceleration signal sensing. In this paper, we introduce a novel design concept of MEMS inertial switch based on direct contact sensing method to eliminate the bouncing effect of the output signal. The switch was designed with a threshold value of 12 g and composed by a proof mass, suspended by six Z-shaped flexure beams. The fabrication was carried out on a silicon-on-insulator (SOI) wafer with standard silicon micromachining. Two glass wafers were used to encapsulate the switch and establish a direct connection between the movable electrode and the detection circuits. According to the centrifugal experiment results, the measured threshold value is around 11.8 g, which is in good agreement with the designed value. The comparison of contact behavior between direct and indirect contact switches was also carried out. The results showed that the direct contact switch could eliminate the output signal bouncing effect, especially when the applied acceleration signal was approximate to the threshold value of the switch. [ABSTRACT FROM AUTHOR]