Publications by Hsiang-Chu Wang

Polarization-Controlled Chromo-Encryption

The response of simple plasmonic nanorods to polarized illumination is studied in detail. Depending on the orientation of that polarization with respect to the symmetry axes of the nanostructure, a chiral response can occur, which can be analyzed through a ...

WILEY-V C H VERLAG GMBH2023

Aperture-Controlled Fabrication of All-Dielectric Structural Color Pixels

Philippe Renaud, Arnaud Bertsch, Olivier Martin, Daniel Migliozzi, Clémentine Sophie Sarah Lipp, Evgenii Glushkov, Hsiang-Chu Wang, Audrey Zoé Marie Jacquillat

While interference colors have been known for a longtime, conventionalcolor filters have large spatial dimensions and cannot be used tocreate compact pixelized color pictures. Here we report a simple yetelegant interference-based method of creating microsc ...

AMER CHEMICAL SOC2023

Pitfalls in the spectral measurements of polarization-altering metasurfaces

Olivier Martin, Hsiang-Chu Wang

The optical characterization of metasurfaces and nanostructures that alter the polarization of light is tricky and can lead to unphysical results, such as reflectance beyond unity. We track the origin of such pitfalls to the response of some typical optica ...

Optica Publishing Group2022

Precise Capillary‐Assisted Nanoparticle Assembly in Reusable Templates

Giovanni Boero, Jürgen Brugger, Olivier Martin, Henry Shao-Chi Yu, Hsiang-Chu Wang, Ana Conde Rubio

Capillary-assisted particle assembly (CAPA) in predefined topographical templates is a scalable method for the precise positioning of nanoscale objects on various surfaces. High-resolution CAPA templates are typically fabricated by expensive electron-beam ...

2022

Robustness Analysis of Metasurfaces: Perfect Structures Are Not Always the Best

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

Optical metasurfaces rely on subwavelength scale nanostructures, which puts significant constraints on nanofabrication accuracies. These constraints are becoming increasingly important, as metasurfaces are maturing toward real applications that require the ...

AMER CHEMICAL SOC2022

Optical metasurfaces: synthesis, nanofabrication, and colorful applications

Hsiang-Chu Wang

In this thesis, we mainly utilize silver to construct the meta-atoms. Although suffering from easily oxidized, its excellent lossless property throughout the visible range makes it suitable for study. When preserved properly, silver-made metasurfaces can s ...

EPFL2022

A Low-Temperature Annealing Method for Alloy Nanostructures and Metasurfaces: Unlocking a Novel Degree of Freedom

Christian Santschi, Olivier Martin, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

The material and exact shape of a nanostructure determine its optical response, which is especially strong for plasmonic metals. Unfortunately, only a few plasmonic metals are available, which limits the spectral range where these strong optical effects ca ...

Wiley-V C H Verlag Gmbh2022

Perfect gradient metasurfaces are not the most efficient

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

Metasurfaces rely on the resonances of nanostructures with dimensions in the nanometer range for devices working in the visible regime. The corresponding fabrication technology requires E-beam exposure and can be quite challenging. It is prone to defects a ...

2021

Hologram generated by alloy metasurfaces

Olivier Martin, Debdatta Ray, Hsiang-Chu Wang

2020

Robustness analysis of metasurfaces

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

2020

Extending limits of plasmonics with unconventional metasurfaces

Olivier Martin, Raziman Thottungal Valapu, Madasamy Thangamuthu, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

2020

Extending the limits of conventional plasmonics with low temperature alloying of noble metals

Christian Santschi, Olivier Martin, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

2020

Tailoring upconversion luminescence with multi-resonant antennas

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

2019

Optical Force Control Using Phase-Gradient Metasurfaces

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

We propose to control the motion of nanoparticles using phase-gradient metasurfaces. The latter are used to generate surface waves, which put the particles into motion, when illuminated by a normally incident plane wave. We present an initial study of the ...

IEEE2018

Upconversion luminescence enhanced by optical antennas

Olivier Martin, Karim Achouri, Hsiang-Chu Wang

2018