Temperature control variable-focus zone plate device
By using a temperature-controlled zoom zone plate device, concentric rings are set on a sapphire substrate using the phase transition properties of VO2 material to achieve dynamic adjustment of the focal point. This solves the problem that existing zone plates cannot control the focal point, reduces system complexity and cost, and is suitable for multiple application fields.
Patent Information
- Application Number
- CN202423218816.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing zone plates cannot achieve dynamic control of the focal position, which limits their application in fields such as photography, microscopic observation and medical testing. Furthermore, mechanical adjustment or lens replacement solutions increase the system size, weight and cost.
A temperature-controlled zoom zone plate device is adopted, which utilizes the phase transition characteristics of VO2 material. VO2 and Au concentric rings are set on a sapphire substrate. The focus is dynamically adjusted by temperature control. The width of the light transmission band is changed by the metallic or dielectric properties of VO2 material at different temperatures, thereby achieving focus zoom.
It achieves dynamic control of the focal position, reduces mechanical components, lowers system complexity and cost, and is applicable to photographic equipment such as mobile phones and cameras, and can be extended to fields such as military reconnaissance and medical testing.
Smart Images
Figure CN223539030U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of zone plate technology, and more specifically to a temperature-controlled zoom zone plate device. Background Technology
[0002] A zone plate is a classic wavefront-controlled optical device. By designing a series of concentric rings that are both transparent and opaque, it can focus transmitted light to a specific position. However, once a zone plate is manufactured, the focusing position for a specific wavelength of light is fixed, making dynamic control impossible. In practical applications, however, there is a pressing need for zoomable optical devices in many scenarios, such as photography, microscopy, and medical testing. Currently, zooming is achieved by mechanically adjusting the distance between lenses in a lens group or by replacing different types of lenses or zone plates. These solutions, relying on mechanical adjustment or optical element replacement, not only increase the system's size, weight, complexity, and cost but also limit the adjustment speed. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a temperature-controlled zoom zone plate device with variable focus.
[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a temperature-controlled zoom zone plate device, comprising a zoom zone plate body, wherein the zoom zone plate body includes a sapphire substrate and a plurality of concentric rings spaced apart on the sapphire substrate, each concentric ring being composed of two nested concentric ring bodies, and the two concentric ring bodies being made of VO2 material and Au material respectively from the inside to the outside, and when the temperature of the zoom zone plate body is higher than 353K, the principal focal point is located at (0, 0, ...). At a temperature below 353K, the focal point is located at (0, 0, ...). ) place, and =2 .
[0005] Furthermore, the radius of the region on the sapphire substrate without the concentric rings satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number.
[0006] Furthermore, the radius of the concentric ring made of VO2 material satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number.
[0007] Furthermore, the radius of the concentric ring made of Au material satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number.
[0008] Furthermore, the concentric rings made of VO2 material have a thickness greater than 1 μm, and the concentric rings made of Au material have a thickness greater than 100 nm.
[0009] Furthermore, it also includes a heat-conducting carrier for placing the zoom zone plate body, a plurality of heating elements disposed on the heat-conducting carrier and located around the zoom zone plate body, a temperature sensor, and a temperature controller for controlling the heating elements.
[0010] The beneficial effects of this utility model are reflected in:
[0011] This utility model's temperature-controlled zoom zone plate device uses a sapphire substrate as the zoom zone plate body, on which multiple concentric rings are spaced apart. Each concentric ring is composed of concentric rings made of VO2 material and concentric rings made of Au material nested together. When the temperature of the zoom zone plate body exceeds 353K, the VO2 material exhibits metallic properties, and the width of the opaque concentric rings in the zoom zone plate body increases, with the focal point located at (0, 0, ...). At (0, 0, ...); when the temperature is below 353K, the VO2 material exhibits dielectric properties, the width of the concentric rings transmitting light in the zoom zone plate increases, and the focal point is located at (0, 0, ...). At this point, zoom is achieved. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the main structure of the zoom zone plate of this utility model;
[0013] Figure 2 This is a schematic diagram of the structure of a practical temperature-controlled zoom zone plate device;
[0014] Figure 3 This is a schematic diagram showing the edge distribution of each annular zone of the zoom zone plate body of this utility model;
[0015] Figure 4 This is a schematic diagram of the equivalent amplitude distribution of the zone plate body when the zone plate temperature is higher than 353K.
[0016] Figure 5 This is a diagram showing the propagation optical field distribution of a terahertz wave along the z-axis after passing through a zone plate when the zone plate temperature is above 353K.
[0017] Figure 6 This is the axial light intensity distribution diagram of the zone plate body when the zone plate temperature is higher than 353K;
[0018] Figure 7This is a schematic diagram of the equivalent amplitude distribution of the zone plate body when the zone plate temperature is below 353K.
[0019] Figure 8 This is a diagram showing the propagation optical field distribution of a terahertz wave along the z-axis after passing through a zone plate when the zone plate temperature is below 353K.
[0020] Figure 9 This is the axial light intensity distribution diagram of the zone plate body when the zone plate temperature is below 353K.
[0021] The components in the attached diagram are labeled as follows: 1. Zoom zone plate body; 101. Sapphire substrate; 102. Concentric ring; 1021. Concentric ring body; 2. Heat-conducting carrier; 3. Heating element; 4. Temperature sensor; 5. Temperature controller. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.
[0023] See Figure 1-3 .
[0024] This utility model relates to a temperature-controlled zoom zone plate device, comprising a zoom zone plate body 1. The zoom zone plate body 1 includes a sapphire substrate 101 and a plurality of concentric rings 102 spaced apart on the sapphire substrate 101. Each concentric ring 102 is composed of two nested concentric ring bodies 1021, and the two concentric ring bodies 1021 are made of VO2 material and Au material respectively from the inside to the outside. When the temperature of the zoom zone plate body 1 is higher than 353K, the principal focal point is located at (0, 0, ...). At a temperature below 353K, the focal point is located at (0, 0, ...). ) place, and =2 .
[0025] This utility model relates to a zoom zone plate body with a sapphire substrate 101, on which multiple concentric rings 102 are spaced apart. Each concentric ring 102 is composed of concentric ring bodies 1021 made of VO2 material and concentric ring bodies 1021 made of Au material nested together. When the temperature of the zoom zone plate body 1 is higher than 353K, the VO2 material exhibits metallic properties, and the width of the opaque concentric ring bodies 1021 in the zoom zone plate body 1 increases, with the focal point located at (0, 0, ...). At (0, 0, ...); when the temperature is below 353K, the VO2 material exhibits dielectric properties, the width of the concentric rings 1021 transmitting light in the zoom zone plate body 1 increases, and the focal point is located at (0, 0, ...). At this point, zoom is achieved.
[0026] In one embodiment, the radius of the region on the sapphire substrate 101 without the concentric rings 102 satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number. In this embodiment, The areas on the sapphire substrate 101 without concentric rings 102 are: the blank areas between two adjacent concentric rings 102, and the blank area of the innermost concentric ring 102.
[0027] In one embodiment, the radius of the concentric ring 1021 made of VO2 material satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number. In this embodiment, .
[0028] In one embodiment, the radius of the concentric ring 1021 made of Au material satisfies the formula: ,in λ is the wavelength of the incident wave. It is a natural number. In this embodiment, .
[0029] In one embodiment, the concentric ring 1021 made of VO2 material has a thickness greater than 1 μm, and the concentric ring 1021 made of Au material has a thickness greater than 100 nm.
[0030] In one embodiment, the system further includes a heat-conducting carrier 2 for placing the zoom zone plate body 1, a plurality of heating elements 3 disposed on the heat-conducting carrier 2 and located around the zoom zone plate body 1, a temperature sensor 4, and a temperature controller 5 for controlling the heating elements 3. In this embodiment, the temperature controller 5 is connected to the temperature sensor 4 and the heating elements 3. The temperature sensor 5 detects the temperature of the heat-conducting carrier 2 and transmits this information to the temperature controller 5, which then adjusts the temperature of the heating elements 3 to either cool down or heat up.
[0031] The present invention will be further explained below with reference to implementation examples:
[0032] (1) Select the working wavelength as λ=300μm.
[0033] (2) Set the focal length of the zone plate to dynamically adjust the principal focus as follows: =4mm and =8mm.
[0034] (3) The zone plate is based on sapphire material, and several concentric rings of Au and VO2 materials are fabricated on the substrate. The distribution regions of the rings are as follows:
[0035]
[0036]
[0037] (4) When the zone plate temperature is above 353K, the VO2 material exhibits metallic properties, and the width of the opaque concentric rings 1021 in the zone plate increases. The amplitude distribution diagram is shown below. Figure 4 As shown, the black areas represent opaque zones, and the white areas represent translucent zones. The light field distribution of a zone plate with a principal focal length of 4mm, obtained through simulation calculations using scalar diffraction theory, is shown below. Figure 5 As shown, where Figure 5 This represents the optical field distribution of a terahertz wave propagating along the z-axis after passing through a zone plate when the zone plate temperature is above 353 K. Figure 6 It represents the axial light intensity distribution.
[0038] (5) When the zone plate temperature is below 353K, the VO2 material exhibits dielectric properties, and the width of the concentric rings 1021 that transmit light in the zone plate increases. The amplitude distribution diagram is shown below. Figure 7 As shown, the black areas represent opaque zones, and the white areas represent translucent zones. The light field distribution of a zone plate with a principal focal length of 8mm, obtained through simulation calculations using scalar diffraction theory, is shown below. Figure 7 As shown, where Figure 8 This represents the optical field distribution of a terahertz wave propagating along the z-axis after passing through a zone plate when the zone plate temperature is below 353 K. Figure 9 It represents the axial light intensity distribution.
[0039] contrast Figures 5-9 The focusing field distribution shows that this invention can dynamically adjust the position of the main focal point of the zone plate by controlling the temperature. When the temperature of the zone plate is higher than 353K, the main focal point is located at 4mm; when the temperature of the zone plate is lower than 353K, the main focal point is located at 8mm.
[0040] This invention is based on a temperature-controlled VO2 material phase transition method to achieve zoom and intensity control of a zone plate. It has the advantages of no mechanical components, multiple functions, and cost savings. It can be widely used in mobile phones, cameras and other photographic equipment, and can also be further applied to military reconnaissance, medical testing, security and other fields.
[0041] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0042] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.
[0043] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
Claims
1. A temperature-controlled zoom zone plate device, characterized in that, The system includes a zoom zone plate body (1), which includes a sapphire substrate (101) and a plurality of concentric rings (102) spaced apart on the sapphire substrate (101). Each concentric ring (102) is composed of two nested concentric ring bodies (1021), and the two concentric ring bodies (1021) are made of VO2 material and Au material respectively from the inside to the outside. When the temperature of the zoom zone plate body (1) is higher than 353K, the main focus is located at (0, 0, f1), and when the temperature is lower than 353K, the focus is located at (0, 0, f2), and f2 = 2f1.
2. The temperature-controlled zoom zone plate device according to claim 1, characterized in that, The radius of the region on the sapphire substrate (101) without the concentric rings (102) satisfies the formula: r 4m <r<r 4m+1 ,in λ is the wavelength of the incident wave, and m is a natural number.
3. The temperature-controlled zoom zone plate device according to claim 1, characterized in that, The radius of the concentric ring (1021) made of VO2 material satisfies the formula: r 4m+1 <r<r 4m+2 ,in λ is the wavelength of the incident wave, and m is a natural number.
4. The temperature-controlled zoom zone plate device according to claim 1, characterized in that, The radius of the concentric ring (1021) made of Au material satisfies the formula: r 4m+2 <r<r 4m+4 ,in λ is the wavelength of the incident wave, and m is a natural number.
5. The temperature-controlled zoom zone plate device according to claim 1, characterized in that, The thickness of the concentric ring (1021) made of VO2 material is greater than 1 μm, and the thickness of the concentric ring (1021) made of Au material is greater than 100 nm.
6. The temperature-controlled zoom zone plate device according to claim 1, characterized in that, It also includes a heat-conducting carrier (2) for placing the zoom zone plate body (1), a plurality of heating elements (3) disposed on the heat-conducting carrier (2) and located around the zoom zone plate body (1), a temperature sensor (4), and a temperature controller (5) for controlling the heating elements (3).