Figure 7
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Surface functionalization strategies for HC-ARFs. (a–c) SPR-based optical fiber CH4 gas sensor [69]: (a) Cross-sectional of the HC-ARF; (b) X-pol core modes effective RI and loss spectrum; (c) the loss spectrum within the range of CH4 concentration from 0 to 3.5%. (d, e) HC-ARF gas sensor functionalized with GSH-CdTe QDs [76]: (d) immobilization process of CdTe QDs inside the HC-ARF; (e) illustration of NO2 gas-induced fluorescence quenching.
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