U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Wenqi Zhu (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 26 - 36 of 36

Ultrathin Wetting Layer-Free Plasmonic Gold Films

October 3, 2019
Author(s)
Robert Lemasters, Cheng Zhang, Manoj Manjare, Wenqi Zhu, Junyeob Song, Sergei Urazhdin, Henri Lezec, Amit Agrawal, Hayk Harutyunyan
Ultrathin gold films are attractive for plasmonic and metamaterial devices, thanks to their useful optical and optoelectronic properties. However, deposition of ultrathin continuous Au films of few nanometer thickness is challenging and generally requires

Revisiting the Photon-Drag Effect in Metal Films

August 2, 2019
Author(s)
Jared H. Strait, Glenn E. Holland, Wenqi Zhu, Cheng Zhang, Bojan R. Ilic, Amit K. Agrawal, Domenico Pacifici, Henri J. Lezec
The photon-drag effect, the rectified current in a medium induced by conservation of momentum of absorbed or redirected light, is a unique probe of the detailed mechanisms underlying radiation pressure. We revisit this effect in gold, a canonical Drude

Ultrafast Optical Pulse Shaping using Dielectric Metasurfaces

May 2, 2019
Author(s)
Shawn M. Divitt, Wenqi Zhu, Cheng Zhang, Henri Lezec, Amit Agrawal
Simultaneous control of individual frequency-comb lines, and their modulation at the repetition-rate of an ultrafast laser represents the ultimate limit of optical pulse shaping. Remarkable progress in mode-locked lasers and chirped pulse amplifiers

Broadband generation of photonic spin-controlled arbitrary accelerating light beams in the visible

February 13, 2019
Author(s)
Qingbin Fan, Wenqi Zhu, Yuzhang Liang, Pengcheng Huo, Cheng Zhang, Amit Agrawal, Kun Huang, Xiangang Luo, Yanqing Lu, Chengwei Qiu, Henri Lezec, Ting Xu
Bending light along arbitrary curvatures is a captivating and popular notion, triggering unprecedented endeavors in achieving quasi-diffraction-free propagation along a curved path in free-space. Much effort has been devoted to achieving this goal in

Robust Extraction of Hyperbolic Metamaterial Permittivity using Total Internal Reflection Ellipsometry

June 20, 2018
Author(s)
Cheng Zhang, Nina Hong, Chengang Ji, Wenqi Zhu, Xi Chen, Amit K. Agrawal, Zhong Zhang, Tom E. Tiwald, Stefan Schoeche, James N. Hilfiker, L. Jay Guo, Henri J. Lezec
Hyperbolic metamaterials are optical materials characterized by highly anisotropic effective permittivity tensor components having opposite signs along orthogonal directions. The techniques currently employed for characterizing the optical properties of

Surface plasmon polariton laser based on a metallic trench Fabry-Perot resonator

October 6, 2017
Author(s)
Wenqi Zhu, Ting Xu, Haozhu Wang, Cheng Zhang, Parag B. Deotare, Amit K. Agrawal, Henri J. Lezec
Recent years have witnessed growing interest in the development of lasers with small footprint for their potential applications in small-volume sensing and on-chip optical communications. Surface-plasmons – electromagnetic modes evanescently confined to

Quantum mechanical effects in plasmonic structures with subnanometre gaps

June 3, 2016
Author(s)
Wenqi Zhu, Ruben Esteban, Andrei G. Borisov, Jeremy J. Baumberg, Peter Nordlander, Henri J. Lezec, Javier Aizpurua, Kenneth B. Crozier
Metal nanostructures with nanogap features have proven highly effective as building blocks for plasmonic systems as they can provide a wide tuning range of operating frequencies and large near-field enhancements. It has recently become apparent that

High-contrast and fast electrochromic switching enabled by plasmonics

January 27, 2016
Author(s)
Ting Xu, Erich C. Walter, Amit Agrawal, Christopher C. Bohn, Jeyavel Velmurugan, Wenqi Zhu, Henri Lezec, Albert A. Talin
With vibrant colours and simple, room-temperature processing methods, electrochromic polymers have attracted attention as active materials for flexible, low-power-consuming devices. However, slow switching speeds in devices realized to date, as well as the