Acta Optica Sinica, Volume. 41, Issue 17, 1724001(2021)
Objective-Coupled Wavelength and Angle Co-Modulated Surface Plasmon Resonance Sensor
Wavelength-modulated surface plasmon resonance (SPR) sensors based on prism coupling can obtain high detection sensitivity only in the long-wavelength band but cannot take both detection range and detection sensitivity into account. In this work, we proposed a wavelength and angle co-modulated SPR sensor using the surface plasmons excited by objective-coupling. Through angle adjustment via objective coupling, the detection sensitivity of the SPR sensor in the short-wavelength band is improved, and the refractive index is measured with high sensitivity in a large detection range. Through simulations and experiments, the refractive indices of glucose solutions with different concentration were measured with the proposed method. The dynamic detection range is 4.4×10 -2 RIU, and the detection sensitivity is 5066.97 nm/RIU. In comparison with the wavelength-modulated SPR sensing method, the detection sensitivity of the wavelength and angle co-modulated SPR sensing method is increased by 2.5 times in the same detection range. This method achieves the real-time and rapid detection of refractive indices with high sensitivity in a large dynamic detection range, and it can be widely applied to biomedicine, food safety, and other fields.
Get Citation
Copy Citation Text
Chang Wang, Xue Wang, Xuqing Sun, Ruxue Wei, Hongyao Liu, Xiaojuan Sun, Fei Wang, Xinchao Lu, Chengjun Huang. Objective-Coupled Wavelength and Angle Co-Modulated Surface Plasmon Resonance Sensor[J]. Acta Optica Sinica, 2021, 41(17): 1724001
Category: Optics at Surfaces
Received: Jan. 11, 2021
Accepted: Mar. 19, 2021
Published Online: Sep. 3, 2021
The Author Email: Lu Xinchao (luxinchao@ime.ac.cn)