Infrared long-wave-pass optical filter applied to medical or communication field

Abstract

The utility model discloses an infrared long-wave-pass optical filter applied to the field of medical treatment or communication. The infrared long-wave-pass optical filter comprises a substrate layer located in the middle, a main film structure layer arranged on the upper portion of the substrate layer, and a secondary film structure layer arranged on the lower portion of the substrate layer. A first metal film layer, a second metal film layer and a third metal film layer are arranged outside the main film structure layer; the main film structure layer is composed of four high-refractive-index film structures and four low-refractive-index film structures which are alternately overlapped outwards along one side close to the substrate layer, and the secondary film structure layer is composed of four high-refractive-index film structures and four low-refractive-index film structures which are alternately overlapped outwards along one side close to the substrate layer. The infrared long-wave-pass optical filter applied to the medical or communication field has the advantages of high hardness, high heat resistance, high transparency in a near infrared (NIR) region of 1260-1670nm, excellent physical and chemical characteristics such as difficulty in abrasion and deformation, and transmittance Tgt in a communication channel wavelength range of 1260-1670nm; 99%.

Description

Technical Field

[0001] This utility model relates to the field of infrared long-pass filter manufacturing, specifically to an infrared long-pass filter used in the medical or communication fields. Background Technology

[0002] Infrared long-pass filters achieve selective transmission of specific wavelengths in the infrared spectrum through specific film system designs. Their working principle is based on the interference and reflection effects of light, forming filters with specific cutoff wavelengths and transmittance by alternately depositing high-refractive-index and low-refractive-index materials.

[0003] In the medical field, it can be used for non-contact temperature measurement and human thermal imaging systems, effectively isolating environmental interference and improving measurement accuracy.

[0004] In the field of communications, by filtering out stray light, infrared long-pass filters reduce signal attenuation and interference, ensuring long-distance, high-speed data transmission.

[0005] Therefore, it has become very urgent to improve the performance of infrared long-pass filters to meet the requirements of high durability and high precision. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide an infrared long-pass filter for use in the medical or communication fields.

[0007] An infrared long-pass filter for use in medical or communications fields includes:

[0008] The base layer is located in the middle, and the main membrane structure layer is disposed on the upper part of the base layer.

[0009] A sub-membrane structure layer is provided at the lower part of the substrate layer;

[0010] A first metal film layer, a second metal film layer, and a third metal film layer are disposed outside the main film structure layer;

[0011] The main film structure layer consists of four layers of high-refractive-index film structure and low-refractive-index film structure alternately stacked outwards along the side closest to the substrate layer.

[0012] The main membrane structure layer is shown below:

[0013] Substrate layer / 86.45 nmH, 36.37 nmL, 193.22 nmH, 251.12 nmL / first metal film layer;

[0014] The sub-film structure layer consists of four layers of high-refractive-index and low-refractive-index film structures alternately stacked outwards along the side closest to the substrate layer.

[0015] The submembrane structure layer is shown below:

[0016] Base layer / 86.45 nmH, 36.37 nmL, 193.22 nmH, 251.12 nmL / air;

[0017] Wherein, H represents a high refractive index film structure, L represents a low refractive index film structure, and the nanometers before H and L represent the thickness of the corresponding film structure.

[0018] The thickness of the first metal film is 50 nm.

[0019] The thickness of the second metal film is 120 nm.

[0020] The thickness of the third metal film is 530 nm.

[0021] In a preferred embodiment of this utility model, the high refractive index film structure is made of tantalum pentoxide (Ta2O5).

[0022] In a preferred embodiment of this utility model, the low refractive index film structure is made of silicon dioxide (SiO2).

[0023] In a preferred embodiment of this utility model, the first metal film layer is made of titanium (Ti).

[0024] In a preferred embodiment of this utility model, the second metal film layer is made of nickel (Ni).

[0025] In a preferred embodiment of this utility model, the third metal film layer is made of gold (Au).

[0026] In a preferred embodiment of this utility model, the working wavelength of the infrared long-pass filter is 1200-1700nm.

[0027] In a preferred embodiment of this utility model, the substrate layer is made of sapphire.

[0028] In a preferred embodiment of the present invention, the first metal film layer is disposed on the outside of the main film structure layer by a high-temperature welding process.

[0029] The beneficial effects of this utility model are as follows:

[0030] The infrared long-pass filter of this invention, used in the medical or communication fields, has high hardness, high heat resistance, high transparency in the near-infrared (NIR) region of 1260-1670nm, and excellent physical and chemical properties such as being resistant to wear and deformation, as well as a transmittance T>99% in the communication channel wavelength range of 1260-1670nm. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 This is a schematic diagram illustrating the effect of an embodiment of the present invention.

[0033] Figure 3 for Figure 2 A partial schematic diagram. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] like Figure 1 The infrared long-pass filter shown includes a base layer 100 located in the middle, and a main film structure layer 200 disposed on the upper part of the base layer 100.

[0037] A secondary membrane structure layer 300 is provided at the lower part of the substrate layer 100, and the main membrane structure layer 200 consists of four layers of high refractive index membrane structure and low refractive index membrane structure that are alternately stacked outward along the side close to the substrate layer 100.

[0038] The main film structure layer 200 is as follows: base layer / 86.45nmH, 36.37nmmL, 193.22nmH, 251.12nmmL / first metal film layer 410.

[0039] The secondary membrane structure layer 300 consists of four layers of high-refractive-index and low-refractive-index membrane structures that are alternately stacked outwards along the side closest to the substrate layer 100.

[0040] The secondary membrane structure layer 300 is shown below:

[0041] Base layer / 86.45 nmH, 36.37 nmL, 193.22 nmH, 251.12 nmL / air.

[0042] Where H represents a high refractive index film structure, L represents a low refractive index film structure, and the nanometers before H and L represent the thickness of the corresponding film structure.

[0043] The high-refractive-index film structure is made of tantalum pentoxide (Ta₂O₅). The low-refractive-index film structure is made of silicon dioxide (SiO₂).

[0044] The high refractive index and low refractive index here refer to two alternating superimposed film structures in comparison.

[0045] To improve product performance, a first metal film layer 410, a second metal film layer 420, and a third metal film layer 430 are provided outside the main membrane structure layer 200.

[0046] The metal film consists of a first metal film layer 410, a second metal film layer 420, and a third metal film layer 430. The thickness of the first metal film layer 410 is 50 nm, the thickness of the second metal film layer 420 is 120 nm, and the thickness of the third metal film layer 430 is 530 nm.

[0047] The first metal film layer is made of titanium (Ti). The second metal film layer is made of nickel (Ni). The third metal film layer is made of gold (Au).

[0048] This setup is because titanium has a good bonding ability with sapphire, so it is used as the first metal film layer.

[0049] Nickel metal, as an intermediate layer, plays a crucial role in connecting the upper and lower layers, and is therefore used as the second metal film layer.

[0050] Metallic gold can improve welding ability and prevent the membrane material from penetrating during the use of infrared long-wave pass filters, so it is used as a third metallic membrane.

[0051] The first metal film layer 410 is set outside the main membrane structure layer 200 by a high-temperature welding process.

[0052] The base layer 100 is made of sapphire. Sapphire was chosen because of its high hardness and scratch resistance. Sapphire has a Mohs hardness of 9, ranking first among metals, second only to diamond.

[0053] The infrared long-pass filter of this invention operates in the 1200-1700nm wavelength range.

[0054] It exhibits high transparency in the near-infrared (NIR) region (1260-1670 nm) and excellent physical and chemical properties such as resistance to wear and deformation, as well as a transmittance (T>99%) in the communication channel wavelength range of 1260-1670 nm. This effectively isolates environmental interference and improves measurement accuracy.

[0055] This reduces signal attenuation and interference, ensuring long-distance, high-speed data transmission. Its effect is as follows: Figure 2 Or as shown in Figure 3.

[0056] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0057] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. An infrared long-pass filter for use in the medical or communication fields, characterized in that, include: The base layer is located in the middle, and the main membrane structure layer is disposed on the upper part of the base layer. A sub-membrane structure layer is provided at the lower part of the substrate layer; A first metal film layer, a second metal film layer, and a third metal film layer are disposed outside the main film structure layer; The main film structure layer consists of four layers of high-refractive-index film structure and low-refractive-index film structure alternately stacked outwards along the side closest to the substrate layer. The main membrane structure layer is shown below: Substrate layer / 86.45 nmH, 36.37 nmL, 193.22 nmH, 251.12 nmL / first metal film layer; The sub-film structure layer consists of four layers of high-refractive-index and low-refractive-index film structures alternately stacked outwards along the side closest to the substrate layer. The submembrane structure layer is shown below: Base layer / 86.45 nmH, 36.37 nmL, 193.22 nmH, 251.12 nmL / air; Wherein, H represents a high refractive index film structure, L represents a low refractive index film structure, and the nanometers before H and L represent the thickness of the corresponding film structure. The thickness of the first metal film is 50 nm. The thickness of the second metal film is 120 nm. The thickness of the third metal film is 530 nm.

2. The infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The high refractive index film structure is made of tantalum pentoxide (Ta2O5).

3. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The low-refractive-index film structure is made of silicon dioxide (SiO2).

4. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The first metal film layer is made of titanium (Ti).

5. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The second metal film layer is made of nickel (Ni).

6. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The third metal film layer is made of gold (Au).

7. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The infrared long-wave pass filter operates in the 1200-1700nm band.

8. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The base layer is made of sapphire.

9. An infrared long-pass filter for use in the medical or communication fields as described in claim 1, characterized in that, The first metal film layer is disposed on the outside of the main film structure layer by a high-temperature welding process.

Images