Publications (22)
Negative refraction based on purely imaginary conjugate metamaterials
Yangyang Fu, Yadong Xu, Huanyang Chen
By introducing a new mechanism based on purely imaginary conjugate metamaterials (PICMs), we reveal that bidirectional negative refraction and planar focusing can be obtained using…
Spatial Fluctuation of the Electric Field within SF6 Streamer Channel in Highly Non-Uniform Fields: Phenomenon, Validation, and Mechanism
Zihao Feng, Xinxin Wang, Xiaobing Zou +2
The electric field within the streamer channel is a critical parameter in the calculation model for the nonlinear breakdown voltage of SF6, motivating the research presented in thi…
Asymmetric nonlinear-mode-conversion in an optical waveguide with PT symmetry
Changdong Chen, Youwen Liu, Lina Zhao +2
Asymmetric mode transformation in waveguide is of great significance for on-chip integrated devices with one-way effect, while it is challenging to achieve asymmetric nonlinear-mod…
Coherent perfect absorption and laser modes in a cylindrical structure of conjugate metamaterials
Yangyang Fu, Yadong Xu, Huanyang Chen +1
In this work, we theoretically find that coherent perfect absorption (CPA) and laser modes can be realized in a two-dimensional cylindrical structure composed of conjugate metamate…
Charge transport and mode transition in dual-energy electron beam diodes
Chubin Lin, Jiandong Chen, Huihui Wang +1
This Letter uncovers five distinct charge transport modes and their transitions in dual-energy electron beam diodes. We via first-principle particle-in-cell (PIC) simulations estab…
Learning-based Framework for Sensor Fault-Tolerant Building HVAC Control with Model-assisted Learning
Shichao Xu, Yangyang Fu, Yixuan Wang +2
As people spend up to 87% of their time indoors, intelligent Heating, Ventilation, and Air Conditioning (HVAC) systems in buildings are essential for maintaining occupant comfort a…
SF6 streamer breakdown induced by floating linear metal particles: Following streamers and side streamers
Zihao Feng, Liyang Zhang, Xinxin Wang +3
The electrical breakdown of SF6 in the presence of floating metal particles is facilitated by two key factors: the role of floating metal particles and the nonlinear breakdown beha…
Switchable bifunctional metasurfaces: nearly perfect retroreflection and absorption at THz regime
Shan Zhu, Yanyan Cao, Yangyang Fu +4
Here we make use of vanadium dioxide (VO2) to design a bifunctional metasurface working at the same targeted frequency. With the increase of temperature, the functionality of the d…
Coherent perfect absorber and laser in purely imaginary conjugate metamaterials
Yangyang Fu, Yanyan Cao, Steven A. Cummer +2
Conjugate metamaterials, in which the permittivity and the permeability are complex conjugates of each other, possess the elements of loss and gain simultaneously. By employing a c…
Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings
Yangyang Fu, Jiaqi Tao, Ailing Song +2
In this work, we designed and studied a feasible dual-layer binary metagrating, which can realize controllable asymmetric transmission and beam splitting with nearly perfect perfor…
A critical review of cyber-physical security for building automation systems
Guowen Li, Lingyu Ren, Yangyang Fu +7
Modern Building Automation Systems (BASs), as the brain that enables the smartness of a smart building, often require increased connectivity both among system components as well as…
Compact Acoustic Retroreflector Based on A Mirrored Luneburg Lens
Yangyang Fu, Junfei Li, Yangbo Xie +4
We propose and demonstrate a compact acoustic retroreflector that reroutes probing signals back towards the source with minimal scattering. Gradient refractive index (GRIN) acousti…
Development of a hardware-In-the-Loop (HIL) testbed for cyber-physical security in smart buildings
Guowen Li, Zhiyao Yang, Yangyang Fu +3
As smart buildings move towards open communication technologies, providing access to the Building Automation System (BAS) through the intranet, or even remotely through the Interne…
Microscopic characteristics of SF6 partial discharge induced by a floating linear metal particle
Zihao Feng, Yuanyuan Jiang, Liyang Zhang +6
Direct current (DC) gas insulated transmission lines (GILs) have been widely used in power transmission, but might be threatened by partial discharge due to the presence of floatin…
Similarity Theory and Scaling Networks for Electromagnetic Wave-Driven Plasmas
Hanyang Li, Yulia Sharova, Denis Eremin +1
We demonstrate the scale-invariant behavior of electromagnetic wave-driven radio-frequency plasmas across different dimensional scales. Using two-dimensional electromagnetic partic…
Functional control of anomalous reflection via engineered metagratings without polarization limitations
Jingwen Li, Xiao Li, Guohao Zhang +4
Metagratings (MGs) have emerged as a promising platform for manipulating the anomalous propagation of electromagnetic waves. However, traditional methods for designing functional M…
Enhanced third-harmonic generation induced by nonlinear field resonances in plasmonic-graphene metasurfaces
Yulian Liu, Shan Zhu, Qingjia Zhou +5
Nonlinear metasurfaces offer new paradigm for boosting optical effect beyond limitations of conventional materials. In this work, we present an alternative way to produce pronounce…
Conjugate metamaterials and the perfect lens
Yadong Xu, Yangyang Fu, Lin Xu +1
In this letter, we show how transformation optics makes it possible to design what we call conjugate metamaterials. We show that these materials can also serve as substrates for ma…
Phase-gradient metasurfaces based on local Fabry-Perot resonances
Yanyan cao, Bocheng Yu, Yangyang Fu +2
In this work we present a new mechanism for designing phase-gradient metasurfaces (PGMs) to control an electromagnetic wavefront with high efficiency. Specifically, we design a tra…
An Open Source Modeling Framework for Interdependent Energy-Transportation- Communication Infrastructure in Smart and Connected Communities
Xing Lu, Kathryn Hinkelman, Yangyang Fu +4
Infrastructure in future smart and connected communities is envisioned as an aggregate of public services, including the energy, transportation and communication systems, all inter…
Development of a Hardware-in-the-loop Testbed for Laboratory Performance Verification of Flexible Building Equipment in Typical Commercial Buildings
Zhelun Chen, Jin Wen, Steven T. Bushby +9
The goals of reducing energy costs, shifting electricity peaks, increasing the use of renewable energy, and enhancing the stability of the electric grid can be met in part by fully…
Multi-stage Power Scheduling Framework for Data Center with Chilled Water Storage in Energy and Regulation Markets
Yangyang Fu, Xu Han, Jessica Stershic +3
Leveraging electrochemical and thermal energy storage systems has been proposed as a strategy to reduce peak power in data centers. Thermal energy storage systems, such as chilled…