A new kind of kretschmann prism

Abstract

The utility model discloses a novel kretschmann prism belongs to optical detection technical field. The prism includes base prism and two same right triangle structure triangular prism, and one right angle of triangular prism is adhered on base prism through the optical adhesive of 1.516 of refractive index, and two triangular prisms are symmetrically arranged, and the other right angle is located at both sides, and the hypotenuse is located at the inside. The utility model discloses the mirror function of adjusting excitation angle is coupled with prism, utilizes the total internal reflection of triangular prism hypotenuse to complete the incident light angle modulation to excite SPR, does not need the additional mirror, effectively reduces the overall height of optical path, simplifies the adjustment step, improves the excitation efficiency, is more favorable to optical path integration, and is suitable for miniaturization, integrated SPR detection equipment.

Description

Technical Field

[0001] This utility model relates to the field of optical detection technology, and in particular to a novel Krechman prism. Background Technology

[0002] In the field of optical detection, surface plasmon resonance (SPR) technology, with its advantages of high sensitivity and label-free operation, is widely used in many fields such as biomolecular interaction analysis, environmental monitoring, and food safety testing. To meet the excitation conditions for SPR, the Kretschman prism is one of the commonly used excitation devices.

[0003] In existing technologies, Kretschmann prisms are mostly made of borosilicate crown glass (N-BK7), with a refractive index of 1.516, and are widely used in SPR excitation. However, existing Kretschmann prisms often employ a trapezoidal structure in their design. In actual SPR excitation optical paths, to adjust the incident angle of the excitation light to meet different detection requirements, an external mirror is usually required. This method of adjusting the incident angle using an external mirror has significant drawbacks: firstly, the use of an external mirror increases the overall height of the optical path, which is detrimental to the miniaturization and compact design of SPR detection equipment; secondly, it adds steps to adjust the optical path, making the adjustment process cumbersome, reducing work efficiency, and potentially lowering the SPR excitation efficiency due to improper adjustment. It also significantly hinders the integration of the optical path, impeding the application and promotion of SPR technology in integrated optical systems.

[0004] Therefore, in view of the above-mentioned problems of existing Krechman prisms, this utility model proposes a new Krechman prism structure that can reduce the overall height of the optical path, simplify the optical path adjustment steps, improve the excitation efficiency, and facilitate integration. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing Krechmann prisms, such as high optical path height, cumbersome adjustment steps, low excitation efficiency, and difficulty in integration, and to provide a new type of Krechmann prism.

[0006] A novel Krechman prism includes a base prism and two identical triangular prisms;

[0007] The triangular prism has a right-angled triangle structure, and one right-angled side of the triangular prism is bonded to the base prism with optical adhesive.

[0008] The two triangular prisms are symmetrically arranged, with another right angle located on both sides and the hypotenuse located on the inner side.

[0009] Furthermore, the base prism is 20mm long and 4.21mm wide.

[0010] Furthermore, the two right-angled sides of the triangular prism are 10mm and 4.2mm, respectively.

[0011] Furthermore, the refractive index of the optical adhesive is 1.516.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention utilizes a Kretschman prism that couples the function of a reflector for adjusting the excitation angle with the prism itself. It modulates the incident light angle using total internal reflection at the hypotenuse of the triangular prism, thus achieving SPR excitation. This eliminates the need for an external reflector to adjust the incident angle, effectively reducing the overall height of the optical path, simplifying the optical path adjustment steps, improving SPR excitation efficiency, and facilitating optical path integration. This makes it suitable for application in miniaturized, integrated SPR detection equipment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view of the present invention;

[0016] Figure 2 This is a schematic diagram of the optical path of this utility model (the lines with arrows in the figure represent the optical path);

[0017] Figure 3 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] As shown in the attached figure, a novel Krechman prism includes a base prism 1 and two identical triangular prisms 2. The triangular prism 2 has a right-angled triangular structure, with one right-angled side adhered to the base prism 1 by optical adhesive 3. The two triangular prisms 2 are symmetrically arranged, with the other right-angled side located on either side and the hypotenuse located on the inner side.

[0020] In this embodiment, the base prism 1 is 20mm long and 4.21mm wide, made of borosilicate crown glass (N-BK7), which has a stable refractive index, thus ensuring the stability of the optical path. The triangular prism 2 is also made of borosilicate crown glass (N-BK7), with two right-angled sides of 10mm and 4.2mm respectively. One angle of the right-angled triangular prism 2 is 67.19°, forming a good fit with the base prism 1 and ensuring the accuracy of light propagation. The optical adhesive 3 used to bond the triangular prism 2 and the base prism 1 has a refractive index of 1.516. This refractive index matches the refractive indices of the materials of the base prism 1 and the triangular prism 2, ensuring that light passing through the optical adhesive 3 only experiences lateral displacement and does not affect the incident angle, thus guaranteeing the stability and accuracy of the optical path.

[0021] The optical propagation process of the novel Kretschman prism of this invention is as follows: When a horizontal light path is incident perpendicularly on the Kretschman prism, the horizontal light first enters through the right-angled side of the triangular prism 2. At the hypotenuse of the triangular prism 2, total internal reflection is satisfied according to geometric relationships. By adjusting the height of the base prism 1 and the angle of the triangular prism 2, the SPR excitation angle can be adjusted. In the actual manufacturing process of the prism, the triangular prism and the base prism are bonded together using optical adhesive. The optical adhesive acts as a flat plate layer; when light passes through the optical adhesive, only lateral displacement occurs, without affecting the incident angle.

[0022] In summary, the novel Krechman prism of this invention, through its reasonable structural design, effectively solves the problems existing in the prior art and has high practical value and promising prospects for promotion.

[0023] The above description is only a preferred embodiment of this utility model patent and is not intended to limit this utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model patent should be included within the protection scope of this utility model patent.

Claims

1. A novel Krechman prism, characterized in that, It includes a base prism (1) and two identical triangular prisms (2); The triangular prism (2) has a right-angled triangle structure, and one right-angled side of the triangular prism (2) is bonded to the base prism (1) by optical adhesive (3); The two triangular prisms (2) are symmetrically arranged, with the other right angle located on both sides and the hypotenuse located on the inner side.

2. The novel Krechman prism according to claim 1, characterized in that: The base prism (1) is 20 mm long and 4.21 mm wide.

3. The novel Krechman prism according to claim 1, characterized in that: The two right-angled sides of the triangular prism (2) are 10mm and 4.2mm respectively.

4. The novel Krechman prism according to claim 1, characterized in that: The optical adhesive (3) has a refractive index of 1.516.

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