Abstract-A 270 GHz × 9 Multiplier Chain MMIC With On-Chip Dielectric-Resonator Antenna

Debin Hou, Jixin Chen, Pinpin Yan,  Wei Hong, 

http://ieeexplore.ieee.org/document/8253519/

This paper presents a 270 GHz × 9 multiplier chain with on-chip dielectric-resonator antenna (DRA) developed in a commercial 0.1-μm GaAs pseudomorphic high electron-mobility transistor technology with cutoff frequencies fT/fMAX of 130/180 GHz. The multiplier integrates a W-band tripler followed by a driver amplifier, a J-band tripler, and an on-chip antenna. The multiplier breakout achieves a measured peak output power of –4 dBm at 270 GHz and a 3-dB bandwidth of 40 GHz (from 255 to 295 GHz). By introducing the high-pass matching network into the multiplier design, the in-band unwanted harmonic suppression is improved to be over 40 dBc within the entire bandwidth. The higher order mode (TEδ13mode) dielectric resonator is introduced in the on-chip antenna design to enhance the antenna gain and bandwidth without additional chip area consumption. The multiplier chain with the on-chip DRA has a measured EIRP of +2 dBm at 270 GHz and a 3-dB bandwidth of 33 GHz (from 258 to 291 GHz). Compared with other J-band multipliers, this paper achieves the best spurious suppression and comparable output power while using the technology with the lowest cutoff frequencies

Abstract-Asymmetric optical transmission based on unidirectional excitation of surface plasmon polaritons in gradient metasurface

Yonghong Ling, Lirong Huang, Wei Hong, Tongjun Liu, Yali Sun, Jing Luan, and Gang Yuan

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-12-13648

Asymmetric optical transmission is fundamental and highly desirable in information processing and full manipulation of lightwave. We here propose an asymmetric optical transmission device consisting of a gradient metasurface and a one-dimensional subwavelength grating. Owing to the unidirectional excitation of surface plasmon polaritons (SPPs) by the gradient metasurface, and SPP-assisted extraordinary optical transmission, forward incident light has much higher transmission than the backward one. We combine temporal coupled mode theory and finite-difference time-domain simulations to verify its operation principle and study the performance. The results indicate that asymmetric transmission with high-contrast and large forward transmittance can be obtained around the 1.3 µm optical communication band.

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