Visible light communication light detector receiver module based on super lens

Abstract

The application discloses a visible light communication light detector receiver module based on a super-structure lens, which comprises color photoelectric detector packaging supports, four photoelectric detector die fixing positions are symmetrically arranged on each color photoelectric detector packaging support, the four photoelectric detector dies are red light photoelectric detector dies, yellow light photoelectric detector dies, green light photoelectric detector dies and blue light photoelectric detector dies, then red light polarization-insensitive super-structure lenses, yellow light polarization-insensitive super-structure lenses, green light polarization-insensitive super-structure lenses and blue light polarization-insensitive super-structure lenses are attached to the four photoelectric detector dies respectively, and the positive and negative electrodes are connected with the positive and negative electrodes of the color photoelectric detector packaging supports through positive and negative electrode metal bonding wires respectively. The module not only makes the visible light communication receiver smaller in size, reduces the difficulty of integrating the visible light communication receiver in industrial and consumer electronic products, but also improves the efficiency of the visible light communication receiver.

Description

Technical Field

[0001] This invention relates to visible light communication optical detector receiver modules, and more particularly to a visible light communication optical detector receiver module based on metalenses. Background Technology

[0002] Traditional wireless communication faces the problem of frequency band depletion, while the visible light spectrum has approximately 400 THZ. To alleviate the current shortage of spectrum resources, researchers worldwide have begun developing communication technologies utilizing the visible light band. Furthermore, with the widespread adoption of LED products in lighting, information can be easily loaded into the rapidly changing light of LEDs. After passing through a channel, the light signal is received by a photodetector at the receiving end, and the original signal is recovered through signal processing, achieving effective information transmission and realizing the dual functions of visible light communication and lighting. In addition, visible light communication is free from electromagnetic interference and does not produce electromagnetic radiation to the human body. The corresponding visible light communication transmitter, LED, is also environmentally friendly. Therefore, visible light communication is a technology with enormous potential value.

[0003] Typical visible light communication uses white LEDs as transmitters, which generate white light by combining blue LEDs with corresponding phosphors. This type of white light communication often only utilizes the blue light portion of the illumination to modulate information. Consequently, the receiving device for such visible light communication typically uses a photodetector only in the blue light band, limiting the bandwidth of the white light LED. Furthermore, visible light receivers usually use Fresnel lenses, which increases their size, making them difficult to integrate into industrial and consumer electronics products. Moreover, the optical efficiency of Fresnel lenses decreases with larger numerical apertures compared to smaller numerical apertures. Summary of the Invention

[0004] Technical Problem: The purpose of this invention is to provide a visible light communication optical detector receiver module based on a metalens, comprising a blue photodetector, a green photodetector, a yellow photodetector, and a red photodetector, packaged in a metalens four-in-one module. Compared to traditional Fresnel lens visible light receivers, this allows for a significant reduction in size while maintaining a certain level of optical efficiency.

[0005] Technical Solution: This invention employs a visible light communication optical detector receiver module based on metalenses, comprising a photodetector packaging bracket. Four photodetector dies are symmetrically fixed at positions on the photodetector packaging bracket. The four photodetector dies are designated as red, yellow, green, and blue photodetector dies. Red polarization-insensitive metalenses are then mounted on the red photodetector die, yellow polarization-insensitive metalenses on the yellow photodetector die, green polarization-insensitive metalenses on the green photodetector die, and blue polarization-insensitive metalenses on the blue photodetector die, respectively. The red, yellow, green, and blue photodetector dies are connected to the positive and negative electrodes of the photodetector packaging bracket via positive and negative electrode metal bonding wires.

[0006] The red, yellow, green, and blue photodetector chips are respectively connected to the photodetector bracket using die bond adhesive, solder paste, or eutectic solder.

[0007] The surfaces of the red-light polarization-insensitive metalens, yellow-light polarization-insensitive metalens, green-light polarization-insensitive metalens, and blue-light polarization-insensitive metalens are also provided with nanostructure pillars.

[0008] The nanostructure pillars are made of titanium dioxide, with diameters ranging from 20 nm to 300 nm and heights ranging from 100 nm to 700 nm.

[0009] The nanostructure pillars at different positions on the surfaces of the red-light polarization-insensitive metalens, yellow-light polarization-insensitive metalens, green-light polarization-insensitive metalens, and blue-light polarization-insensitive metalens form a nanopillar array, the phase distribution of which is as follows:

[0010] Where f is the focal length of the superlens, λ is the incident light wavelength of the red, yellow, green and blue superlenses, and (x,y) is the coordinate of the superlens.

[0011] The surfaces of the red, yellow, green, and blue photodetector chips are respectively coated with a silicone layer or have an air layer. Then, a red polarization-insensitive meta-lens is attached to the silicone layer or air layer of the red photodetector chip, a yellow polarization-insensitive meta-lens is attached to the silicone layer of the yellow photodetector chip, a green polarization-insensitive meta-lens is attached to the silicone layer or air layer of the green photodetector chip, and a blue polarization-insensitive meta-lens is attached to the silicone layer or air layer of the blue photodetector chip.

[0012] The dimensions of the red and yellow photodetector chips are smaller than those of the green and blue photodetector chips.

[0013] Beneficial effects: Nanoimprinting can achieve compatibility with existing semiconductor manufacturing processes and has a lower mass production cost.

[0014] The polarization-insensitive visible light communication photodetector receiver module based on metalenses boasts a small size, facilitating integration into relevant industrial and consumer electronics products. It enables indoor visible light communication positioning, secure indoor visible light information downloading, and other communication and communication extension functions. Compared to traditional Fresnel lens visible light receivers, it allows for a significant reduction in size while maintaining a certain level of optical efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the polarization-insensitive visible light communication optical detector receiver module of the present invention.

[0016] Figure 2 This is a schematic diagram of the metalens of the present invention.

[0017] The diagram includes: 1. Red photodetector die; 2. Yellow photodetector die; 3. Green photodetector die; 4. Blue photodetector die; 5. Photodetector packaging bracket; 6. Die-attach adhesive, solder paste, or eutectic solder; 7. Bonding wire; 8. Silicone layer or air layer; 9. Red polarization-insensitive metalens; 10. Red polarization-insensitive metalens; 11. Green polarization-insensitive metalens; 12. Blue polarization-insensitive metalens; 13. Nanostructure pillar. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0019] See Figure 1As shown, this polarization-insensitive visible light communication optical detector receiver module includes a blue photodetector 1, a green photodetector 2, a yellow photodetector 3, and a red photodetector 4, integrated into a four-in-one metalens package module. Each photodetector package bracket 5 has a photodetector die mounted on it. The photodetector dies are connected to the respective colored photodetector package brackets 5 via die-attach adhesive, solder paste, or eutectic solder 6. Bonding leads 7 are present on the electrodes of the photodetector dies. The photodetector dies are connected to the positive and negative electrodes respectively via positive and negative electrode metal bonding lines. The photodetector chip has a silicone layer or an air layer 8 coated on its surface, and red polarization-insensitive metalenses 9, 10, 11, and 12, respectively. Alternatively, only red polarization-insensitive metalenses 9, 10, 11, and 12 may be placed within a certain distance on the photodetector chip. This not only makes the size of visible light communication receivers smaller, reducing the difficulty of integrating visible light communication receivers into industrial and consumer electronics products, but also improves the efficiency of visible light communication receivers.

[0020] The polarization-insensitive visible light communication photodetector receiver module based on metalens converts the received red, yellow, green, and blue visible light into electrical signals through photodetectors.

[0021] Furthermore, the metalens is a polarization-insensitive metalens. The substrate of the metalens is silicon dioxide, and the nanostructure material is titanium dioxide. The received visible red, yellow, green, and blue light portions are focused onto the chip surface of each color detector by the metalens.

[0022] Furthermore, the nanostructure pillars at different positions on the nanostructure pillars 13 provided on the surfaces of the red-light polarization-insensitive metalens 9, yellow-light polarization-insensitive metalens 10, green-light polarization-insensitive metalens 11, and blue-light polarization-insensitive metalens 12 form a nanostructure pillar array, the phase distribution of which is as follows:

[0023] Where f is the focal length of the metalens, λ is the incident light wavelength of the red, yellow, green, and blue metalenses, and (x,y) are the coordinates of the metalens. Through the phase abrupt change characteristics on the metalens surface, the function of focusing parallel light within the incident range and light rays within a certain angle is achieved as much as possible.

[0024] Example 1:

[0025] This polarization-insensitive visible light communication optical detector receiver module involves sequentially fabricating a silicone layer or air layer 8 and red polarization-insensitive metalens 9, 10, green polarization-insensitive metalens 11, and blue polarization-insensitive metalens 12 on the chip surface of each color detector after the die-bonding adhesive, solder paste, or eutectic solder 6 and bonding wire 7 processes are completed. The specific steps are as follows:

[0026] 1) Selection of photodetector chip: The photodetector can be a PIN photodiode or a phototransistor.

[0027] 2) Cleaning the plastic support for die bonding: Plasma cleaning or ultrasonic cleaning can be used.

[0028] 3) Die bonding adhesive, solder paste, or eutectic solder: Die bonding is performed manually or using an automatic die bonder. This can be done by applying silver paste, solder paste, or eutectic soldering.

[0029] 4) Bonding wire: Gold wire ball bonding or aluminum wire ultrasonic bonding can be used, or copper wire or silver wire bonding can be used.

[0030] 5) Silicone layer: A fixed-volume air pressure dispensing method can be used, or a spray dispensing method or a screw extrusion dispensing method can also be used. If it is an air layer, you can directly proceed from process step four to process step six.

[0031] 6) Bonding of meta-lenses: High-precision die bonders are used for picking, alignment and placement.

[0032] 7) Furthermore, for the fabrication of metalenses, high aspect ratio titanium dioxide nanopillars can be fabricated on a silicon dioxide substrate using nanoimprinting.

[0033] Visible light communication has a large number of existing base stations that use LED lighting sources as light emitters. It has no electromagnetic interference and will not cause electromagnetic radiation hazards to the human body. It can achieve secure communication. Therefore, visible light communication is a technology with huge potential value.

[0034] This polarization-insensitive visible light communication photodetector receiver module based on metalenses, compared to traditional Fresnel lens visible light receiver modules, makes the size of the visible light communication receiver smaller, reducing the difficulty of integrating visible light communication receivers into industrial and consumer electronics products. Moreover, it can maintain or improve the efficiency of the visible light communication receiver, thus making it easier to achieve dual functions of lighting and communication.

[0035] This invention involves sequentially mounting corresponding metalenses onto various photodetectors after die bonding and wire bonding. The metalenses can be fabricated using ultraviolet / extreme ultraviolet lithography, atomic layer deposition, electron beam lithography, or nanoimprint lithography to achieve mass production of micro-nano structures on the surface of the metalenses.

[0036] The above description in this specification is merely an illustrative example of the module structure and manufacturing method of the present invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure and features of the present invention or exceed the scope defined in this claim, all of which should be included within the protection scope of the present invention.

Claims

1. A visible light communication photodetector receiver module based on metalenses, characterized in that: The system includes a photodetector packaging bracket (5), on which four photodetector die fixing positions are symmetrically arranged along the center line. The four photodetector dies are red photodetector die (1), yellow photodetector die (2), green photodetector die (3), and blue photodetector die (4). The surfaces of the red photodetector die (1), yellow photodetector die (2), green photodetector die (3), and blue photodetector die (4) are respectively coated with a silicone layer or an air layer (8). Then, red polarization insensitive materials are respectively attached to the silicone layer or air layer (8) of the red photodetector die (1). A super-sensitive lens (9) is attached to the silicone layer or air layer (8) of the yellow light photodetector chip (2), a super-sensitive lens (10) is attached to the silicone layer or air layer (8) of the green light photodetector chip (3), and a super-sensitive lens (12) is attached to the silicone layer or air layer (8) of the blue light photodetector chip (4). The red light photodetector chip (1), yellow light photodetector chip (2), green light photodetector chip (3), and blue light photodetector chip (4) are respectively connected to the positive and negative electrodes of the photodetector packaging bracket (5) through positive and negative electrode metal bonding wires (7).

2. The visible light communication photodetector receiver module based on metalens according to claim 1, characterized in that: The red photodetector die (1), yellow photodetector die (2), green photodetector die (3), and blue photodetector die (4) are respectively connected to the photodetector bracket (5) by die bond adhesive, solder paste, or eutectic solder (6).

3. A visible light communication photodetector receiver module based on a metalens according to claim 2, characterized in that: The surfaces of the red polarization-insensitive meta-lens (9), yellow polarization-insensitive meta-lens (10), green polarization-insensitive meta-lens (11) and blue polarization-insensitive meta-lens (12) are also provided with nanostructure pillars (13).

4. A visible light communication photodetector receiver module based on a metalens according to claim 3, characterized in that: The nanostructure pillar (13) is titanium dioxide, and the diameter of the nanostructure pillar (13) ranges from 20 nm to 300 nm, while the height of the titanium dioxide microstructure ranges from 100 nm to 700 nm.

5. A visible light communication photodetector receiver module based on a metalens according to claim 4, characterized in that: Nanostructured pillars at different positions on the nanostructured pillars (13) on the surfaces of the red-polarization-insensitive metalens (9), yellow-polarization-insensitive metalens (10), green-polarization-insensitive metalens (11), and blue-polarization-insensitive metalens (12) form a nanopillar array, and their phase distribution is as follows: in f λ is the focal length of the metalens. d Let λ be the incident light wavelength of the red, yellow, green, and blue metalenses, and (x, y) be the coordinates of the metalenses.

6. A visible light communication photodetector receiver module based on a metalens according to claim 1, characterized in that: The dimensions of the red photodetector chip (1) and the yellow photodetector chip (2) are smaller than those of the green photodetector chip (3) and the blue photodetector chip (4).

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