Grating-incoupled waveguide-enhanced Raman sensor

被引：3

作者：

Ettabib, Mohamed A. ^{[1
]}

Bowden, Bethany M. ^{[2
]}

Liu, Zhen ^{[1
]}

Marti, Almudena ^{[2
]}

Churchill, Glenn M. ^{[1
]}

Gates, James C. ^{[1
]}

Zervas, Michalis N. ^{[1
]}

Bartlett, Philip N. ^{[2
]}

Wilkinson, James S. ^{[1
]}

机构：

[1] Univ Southampton, Zepler Inst Photon & Nanoelect, Southampton, England

[2] Univ Southampton, Sch Chem, Southampton, England

来源：

PLOS ONE | 2023年 / 18卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

TANTALUM OXIDE; SPECTROSCOPY; INTENSITIES; FREQUENCIES; MONOLAYERS;

D O I：

10.1371/journal.pone.0284058

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We report a waveguide-enhanced Raman spectroscopy (WERS) platform with alignment-tolerant under-chip grating input coupling. The demonstration is based on a 100-nm thick planar (slab) tantalum pentoxide (Ta2O5) waveguide and the use of benzyl alcohol (BnOH) and its deuterated form (d7- BnOH) as reference analytes. The use of grating couplers simplifies the WERS system by providing improved translational alignment tolerance, important for disposable chips, as well as contributing to improved Raman conversion efficiency. The use of non-volatile, non-toxic BnOH and d7-BnOH as chemical analytes results in easily observable shifts in the Raman vibration lines between the two forms, making them good candidates for calibrating Raman systems. The design and fabrication of the waveguide and grating couplers are described, and a discussion of further potential improvements in performance is presented.

引用

页数：14

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