Highly sensitive plasmonic nanoridge hyperbolic metamaterial for biosensing  

作　　者：XINZHAO YUE TAO WANG YAOHUA CAI RUOQIN YAN LU WANG HUIMIN WANG ENZE LV XUYANG YUAN JINWEI ZENG XUEWEN SHU JIAN WANG 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Institute of Hematology,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,China

出　　处：《Photonics Research》2025年第1期113-124,共12页光子学研究(英文版)

基　　金：National Key Research and Development Program of China(2023YFE0105800);National Natural Science Foundation of China(62275084,62275093,62125503);Natural Science Foundation of Hubei Province(2023AFA028).

摘　　要：Artificially designed hyperbolic metamaterials(HMMs)with extraordinary optical anisotropy can support highly sensitive plasmonic sensing detections,showcasing significant potential for advancements in medical research and clinical diagnostics.In this study,we develop a gold nanoridge HMM and disclose the plasmonic sensing physical mechanism based on this type ofHMMthrough theoretical and experimental studies.We determine that the high modal group velocity of plasmonic guided modes stemming from a large transverse permittivity of HMMs directly results in high sensitivity.By combining electron-beam lithography,oxygen plasma etching,and electroplating,the fabricated gold nanoridge array possesses an extremely high structural filling ratio that is difficult to obtain through conventional processes.This leads to a large transverse permittivity and enables highly confined and ultra-sensitive bulk plasmon-polariton(BPP)guided modes.By exciting these modes in the visible to near-infrared region,we achieve a record sensitivity of 53,300 nm/RIU and a figure of merit of 533.Furthermore,the developed plasmonic nanoridge HMM sensor exhibits an enhanced sensitivity of two orders of magnitude compared to that of the same type of HMM sensor in label-free biomolecule detection.Our study not only offers a promising avenue for label-free biosensing but also holds great potential to enhance early disease detection and monitoring.

关 键 词：TRANSVERSE holds ANISOTROPY 

分 类 号：O53[理学—等离子体物理] TP212.3[理学—物理] R318.08[自动化与计算机技术—检测技术与自动化装置]