Controllable fabrication of metallic photonic crystals for ultra-sensitive SERS and photodetectors

Zihe Cai,Yang Yan,Shengxuan Lin,Xiaobin Hu,Lin Liu

doi:10.1039/c7ra11721c

Zihe Cai, Yang Yan + Show 3 more

Open Access

https://doi.org/10.1039/c7ra11721c

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Journal: RSC Advances	Publication Date: Jan 1, 2017
Citations: 5	License type: CC BY 3.0

Affiliation: Shanghai Jiao Tong University

Abstract

Metallic photonic crystals with strong light harvesting capabilities for SERS and photodetectors.

Highlights

Metallic photonic crystals (MPCs), as arti cial ordered nanostructures, have already attracted extensive attention due to their great potential in metamaterials,[1] extraordinary optical transmission (EOT),[2] optical sensors,[3] solar energy conversion[4] and molecular detection.[5]
We propose a general strategy for the controllable fabrication of MPCs with inverse opal structure consisting of plasmonic metals (Ag and Cu) and transition metals (Ni and Co), respectively, which exhibit characteristic optical properties compared with dielectric photonic crystals
We have fabricated a series of MPCs with highly uniform inverse opal structure consisting of plasmonic metals (Ag and Cu) and transition metals (Ni and Co), respectively, by a self-assembly and electrochemical deposition method

Summary

Introduction

Metallic photonic crystals (MPCs), as arti cial ordered nanostructures, have already attracted extensive attention due to their great potential in metamaterials,[1] extraordinary optical transmission (EOT),[2] optical sensors,[3] solar energy conversion[4] and molecular detection.[5]. The effect of the MPC structure on performance is a signi cant issue to explore To solve these problems, we propose a general strategy for the controllable fabrication of MPCs with inverse opal structure consisting of plasmonic metals (Ag and Cu) and transition metals (Ni and Co), respectively, which exhibit characteristic optical properties compared with dielectric photonic crystals. The photonic band gap is quite broad because of the enhanced optical penetration depth in the MPCs, compared with the skin depth of the pure metals These optical properties could be controlled by changing the diameter of the MPCs, illustrating that it is bene cial for applications in SERS and photodetectors. A remarkable rise in photocurrent was observed, when the light was switched on, in Ag and Cu MPCs which exhibited a signi cant rise in a linear model on optical power density, completely reversed compared with semiconductors

Fabrication of metallic photonic crystals

Optical properties of metallic photonic crystals

Ultra-sensitive SERS detection of R6G

Photocurrent responses of the metallic photonic crystals

Conclusions

Fabrication of the metallic photonic crystals

Characterization