Nghiên cứu tăng cường độ chính xác của cảm biến quang học sử dụng ánh sáng cận hồng ngoại định hướng ứng dụng y sinh
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Abstract
This research work presented the figure of merits of optical sensor using prism based on surface plasmon resonance with thin layer of Ag, and the wavelength of 1064 nm. The simulated results showed that the sensor with Ag layer of 60 nm coated will give good responsibility with the detection accuracy was 14 times higher than that of the sensor using wavelength of 633 nm. Moreover, the penetration depth was around 789.6 nm, which was 3.5 times better than that of the case of 633 nm wavelength. In addition, the sensor with a sensitivity of 93.40/RIU was 1.5 times lower in comparison with the case of using 633 nm. The enhancement in detection accuracy and penetration depth for the sensor using wavelength of 1064 nm will be offered advantages for early detection of bateria with size from 1 µm to 20 µm in the biomedical and food applications.
Tóm tắt
Nghiên cứu trình bày kết quả mô phỏng các đặc tính của cảm biến quang học sử dụng lăng kính dựa trên hiệu ứng cộng hưởng plasmon bề mặt với lớp phủ kim loại Ag và bước sóng ánh sáng 1064 nm. Kết quả nghiên cứu cho thấy cảm biến sử dụng lớp Ag với độ dày 60 nm sẽ cho độ chính xác của phép đo cao hơn 14 lần và độ xuyên sâu (789,6 nm) cao hơn 3,5 lần so với cảm biến sử dụng ánh sáng 633 nm. Độ nhạy của cảm biến này có kết quả đạt được là 93,40/RIU, khá cao cho cảm biến sử dụng một lớp kim loại và thấp hơn 1,5 lần so với cảm biến sử dụng bước sóng 633 nm. Việc tăng cường độ chính xác và độ xuyên sâu của cảm biến sử dụng bước sóng 1064 nm đã mở ra tiềm năng ứng dụng lớn của cảm biến này trong lĩnh vực chẩn đoán sớm, dùng để đo các thực thể có kích thước lớn như vi khuẩn (1-20 µm) trong lĩnh vực y sinh.
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