Infra-Red Plasmonic Sensors

Chemosensors

Anthony Centeno¹  Siti Rahmah Aid²  Fang Xie³ 

[1] Department of Electrical and Electronic Engineering, Xi’an Jiaotong Liverpool University, 111 Ren’ai Road, Suzhou Dushu Lake Higher Education Town, Suzhou 215123, China;Department of Electronic Systems Engineering, Malaysia Japan International Institute of Technology, University Technology Malaysia, Kuala Lumpur 54100, Malaysia;Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, UK;

关键词: NIR;    plasmonics;    LSPR;    MIR;    germanium;   

DOI  :  10.3390/chemosensors6010004

来源: DOAJ

【 摘 要 】

Plasmonic sensors exploiting the localized surface plasmon resonance (LSPR) of noble metal nanoparticles are common in the visual spectrum. However, bio-sensors near the infra-red (NIR) windows (600–900 nm and 1000–1400 nm) are of interest, as in these regions the absorption coefficients of water, melanin deoxyglobin, and hemoglobin are all low. The first part of this paper reviews the work that has been undertaken using gold (Au) and silver (Ag) particles in metal enhanced fluorescence (MEF) in the NIR. Despite this success, there are limitations, as there is only a narrow band in the visual and NIR where losses are low for traditional plasmonic materials. Further, noble metals are not compatible with standard silicon manufacturing processes, making it challenging to produce on-chip integrated plasmonic sensors with Au or Ag. Therefore, it is desirable to use different materials for plasmonic chemical and biological sensing, that are foundry-compatible with silicon (Si) and germanium (Ge). One material that has received significant attention is highly-doped Ge, which starts to exhibit metallic properties at a wavelength as short as 6 μm. This is discussed in the second part of the paper and the results of recent analysis are included.

【 授权许可】

Unknown