A fiber optic head for a fiber optic spectrometer
An optical fiber spectrometer and optical fiber head technology, applied in the field of sensors, can solve the problems of affecting the detection limit, low collection efficiency of Raman scattering signals, etc., and achieve the effect of improving the detection limit
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0023] The present invention provides a figure 1 The shown fiber head for fiber optic spectrometer, the fiber head includes a fiber core 1 and noble metal particles 3, a groove 2 is provided at the head near the fiber core 1 and on the side of the fiber core 1, and the noble metal particles 3 are placed in the groove Side and bottom of slot 2. When the fiber optic head is used for molecular Raman spectroscopy test, the excitation light is from figure 1 The right side of the optical fiber head enters, propagates along the optical fiber to the groove 2, and excites the noble metal particles 3 on the side and bottom of the groove 2, thereby generating a local electric field around the noble metal particles 3, producing a surface-enhanced Raman scattering effect, and improving detection limit. Since the noble metal particle 3 is located in the groove 2, the excited Raman signal is collected into the optical fiber, so the present invention improves the collection efficiency of th...
Embodiment 2
[0025] On the basis of Example 1, such as figure 2 As shown, the head of the fiber core is covered with a metal film, and the metal film may be a silver film. The metal film can not only reflect the excitation light propagating from the optical fiber, which is beneficial to enhance the local electric field around the noble metal particles 3, but also reflect the Raman signal generated by the molecules, which can improve the collection efficiency of the optical fiber. The role of the metal film in both aspects can increase the intensity of the finally collected Raman signal, thereby increasing the detection limit. In addition, the metal film can also be noble metal particles 3, and the excitation light passing through the bottom of the groove 2 can excite the surface plasmon resonance of the noble metal particles 3, forming a local electric field, and placing the molecules to be detected in the fiber core 1 On the noble metal particles 3 on the head, this can increase the Ram...
Embodiment 3
[0027] On the basis of Example 1 and Example 2, as image 3 As shown, the groove 2 is an oblique triangle, and one side of the oblique triangle is perpendicular to the fiber core 1 at the end close to the head of the fiber core 1 . In this way, the excitation light propagating along the optical fiber is more concentrated at the bottom of the groove, and more molecules to be detected are also gathered at the bottom of the groove 2, which is conducive to improving the Raman signal intensity and further facilitates molecular detection. In addition, on the basis of Examples 1 and 2, such as Figure 4 As shown, the groove is stepped, and at one end close to the head of the fiber core, the side of the step is straight and perpendicular to the fiber core. In this way, in addition to the beneficial effect of the oblique triangular groove 2, at the bottom of the stepped groove 2, more noble metal particles 3 on the opposite sides are coupled, thereby forming a stronger localized surfa...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More