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A bi-layered complementary metasurface composed of subwavelength scatterers are proposed for orbital angular momentum (OAM) generation at microwave frequencies. It converts a circularly polarized plane wave to a transmitted helical wave carrying the OAM of desired orders with a conversion efficiency of 75%. Our design has low profile and is easy to fabricate, considering the unit cell size, substrate...
This paper presents a photomixer driven antenna with increased output power at continuous-wave (CW) Terahertz (THz). The antenna is supported by membrane and comprised of a horn cavity for enhancing radiation. With improved impedance matching to the source (photomixer), the output power of this antenna is greatly enhanced compared with the existing antenna with 2-µW output power at 1 THz. The proposed...
The conduction mechanisms of dielectric breakdown (BD) in MOS capacitor structure with nanocrystals (NCs) embedded in bi-layer gate stacks (SiO2/Al2O3) are studied systematically. Using a unique stressing methodology of inducing a BD path in one dielectric layer, the charging and discharging phenomenon of the metal NCs and leakage mechanism in the degraded gate stacks are found to be strongly dependent...
This paper provides an experimental assessment of Coulomb scattering mobility for advanced strained devices. By accurate short-channel mobility extraction, we examine the impact of process-induced uniaxial strain on Coulomb mobility in short-channel pMOSFETs. Our extracted Coulomb mobility shows very weak stress dependency at room temperature. This finding has also been verified in both long- and...
A patch antenna with slot as shown in Fig.1 can have up to 40% band [1], and yet very simple to fabricate. This antenna therefore is highly desirable and yet its design theory is not clear because the detailed mechanism of the U-slot is still unknown. This paper is an attempt to remedy this situation based on a fusing of EM and the filter-circuit theory to identify the importance design parameters...
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