Abstract

In this paper, a thick mesoporous silica film (MSF) (more than 700 nm) was fabricated via the two-step enhancing Stöber solution growth approach (ESSGA). According to the optimization based on the transfer matrix method, a thicker MSF sensor has higher waveguide index sensitivity and is more suitable for the adsorbent detection, while a thinner MSF sensor has higher covered medium index sensitivity and is more appropriate for non-adsorbent detection. The covered medium index sensitivity and refractive index resolution of the fabricated MSF optical waveguide sensor were calculated to be 53.18 deg/RIU and ${1.28}\; \times \;{{10}^{ - 6}}\;{\rm RIU}$, respectively. For the detection of a small molecule, hexadecyltrimethylammonium bromide was used as a model of a small molecule to verify its sensing property and its limit of detection (LOD) as low as 1.879 nM was obtained. In order to detect heavy metal ions, the MSF was modified with an amino group by the post-grafted method. The response of the resonance angle shift is more sensitive to ${{\rm Pb}^{2 + }}$ ion than ${{\rm Cu}^{2 + }}$ ion and both their LODs could reach the nanomolar detection level; those are 17.30 and 6.44 nM, respectively.

© 2020 Optical Society of America

Mid-IR sensing platform for trace analysis in aqueous solutions based on a germanium-on-silicon waveguide chip with a mesoporous silica coating for analyte enrichment

Nuria Teigell Benéitez, Bettina Baumgartner, Jeroen Missinne, Sanja Radosavljevic, Dominik Wacht, Stefan Hugger, Paweł Leszcz, Bernard Lendl, and Gunther Roelkens
Opt. Express 28(18) 27013-27027 (2020)

Open-channel-based dual-core D-shaped photonic crystal fiber plasmonic biosensor

Maliha Momtaj, Jannatul Robaiat Mou, Q. M. Kamrunnahar, and Md. A. Islam
Appl. Opt. 59(28) 8856-8865 (2020)

Dual-polarized highly sensitive surface-plasmon-resonance-based chemical and biomolecular sensor

Mohammad Rakibul Islam, A. N. M. Iftekher, Kazi Rakibul Hasan, Md. Julkar Nayen, and Saimon Bin Islam
Appl. Opt. 59(11) 3296-3305 (2020)

High-sensitivity SPR sensor based on the eightfold eccentric core PQF with locally coated indium tin oxide

Qiang Liu, Jiudi Sun, Yudan Sun, Wei Liu, Jingwei Lv, Chao Liu, Xianli Li, Zonghuan Ren, Famei Wang, Wenshu Lu, Yu Jiang, Tao Sun, and Paul K. Chu
Appl. Opt. 59(22) 6484-6489 (2020)

Research on photonic crystal fiber based on a surface plasmon resonance sensor with segmented silver-titanium dioxide film

Hairui Fang, Chenjing Wei, Dong Wang, Long Yuan, Shengxi Jiao, Zhiyu Bao, and Hanrui Yang
J. Opt. Soc. Am. B 37(3) 736-744 (2020)