CN115578928A - Organic polymer echo wall laser fiber flexible label for information storage - Google Patents

Organic polymer echo wall laser fiber flexible label for information storage Download PDF

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Publication number
CN115578928A
CN115578928A CN202211117945.2A CN202211117945A CN115578928A CN 115578928 A CN115578928 A CN 115578928A CN 202211117945 A CN202211117945 A CN 202211117945A CN 115578928 A CN115578928 A CN 115578928A
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CN
China
Prior art keywords
laser
laser fiber
organic polymer
ink
fiber
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Pending
Application number
CN202211117945.2A
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Chinese (zh)
Inventor
郭丹
阮俊
翟天瑞
葛坤
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Beijing University of Technology
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Beijing University of Technology
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Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN202211117945.2A priority Critical patent/CN115578928A/en
Publication of CN115578928A publication Critical patent/CN115578928A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing

Abstract

The invention discloses an organic polymer echo wall laser fiber flexible label for information storage, which comprises a microfiber organic polymer laser for recording information and a polydimethylsiloxane film for flexibly encapsulating fibers. And precisely positioning and printing the nanoparticle ink on the laser fiber by using an ink-jet printing device to form a specific pattern. When the surface of the laser fiber is covered with the nano particles, the nano particles can change the equivalent refractive index of the cylindrical cavity of the laser fiber. When the fiber is pumped by external light, the wavelength distance between the same transverse electric wave mode and transverse magnetic wave mode of laser emitted from the area printed with the nano particles is increased, the wavelength distance between TE mode and TM mode of the unprinted area is not changed, and the wavelength distance between the TE mode and the TM mode is gradually changed by carrying out ink jet for 0 to 4 times on the same position of the fiber. The emergent spectrum is accurately positioned and read on the laser fiber, so that the pattern printed on the laser fiber is obtained and converted into a binary number array, and the binary number array is compared with the preset anti-counterfeiting information, and the anti-counterfeiting function is realized.

Description

Organic polymer echo wall laser fiber flexible label for information storage
Technical Field
The invention relates to an organic polymer echo wall laser fiber flexible label for information storage, and belongs to the technical field of photoelectricity.
Background
The principle of the Whispering-Gallery Mode (WGM) laser is that the phenomenon that electromagnetic waves are totally reflected when propagating from an optically dense medium to an optically sparse medium is utilized, so that light beams circularly propagate at the inner boundary of a WGM microcavity to form resonance, and laser emission is realized. The WGM laser has the characteristics of high quality factor, low threshold value, small mode volume, large optical density and the like, and has important application prospects in laser display, biological detection, sensing and photonic integrated circuits.
At present, the information encryption storage mode on the market is mainly the traditional patterned label such as bar code, two-dimensional code, etc. The label is extremely easy to copy, has poor safety and is easy to damage; in the case of an electromagnetic storage medium, although the storage capacity is large, it is easily damaged by electromagnetic interference. The echo wall laser is a micro-cavity laser with small volume and low threshold, laser emission is realized by total reflection propagation of light beams in a micro-cavity, if a high-refractive-index dielectric material is introduced to increase the surface refractive index of the micro-cavity, the wavelength distance between TE (transverse) and TM (transverse) modes of emitted laser is increased, and the change of the emitted laser signal can be applied to optical information storage. Based on the above consideration, the invention provides an organic polymer echo wall laser fiber flexible label for information storage.
Disclosure of Invention
The invention provides an organic polymer echo wall laser fiber flexible label for information storage, which is characterized in that: the system comprises a microfiber organic polymer laser for recording information, a PDMS film for providing a flexible packaging effect, nanoparticle ink for modulating laser fiber outgoing signals, ink-jet printing equipment for performing anti-counterfeiting coding on laser fibers, and a photoluminescence test system for reading anti-counterfeiting information on the laser fibers; arranging microfiber organic polymer lasers on a glass substrate, printing nanoparticles on the surfaces of fibers by an ink-jet printing device for anti-counterfeiting coding, dripping PDMS (polydimethylsiloxane) on the surface of the substrate to flexibly package the laser fibers, and finally pumping and reading information of the laser fibers subjected to ink-jet printing by a photoluminescence system.
The microfiber type organic polymer laser is polyvinyl alcohol microfiber doped with a laser gain medium, and can emit echo wall laser under external light pumping, wherein the laser gain medium is 4,4' bis (2-sulfostyryl) biphenyl disodium (S420), fluorescein sodium (Uranin), rhodamine 6G (R6G) or rhodamine B (RhB).
The nano-particle ink contains titanium dioxide (TiO) 2 ) Or barium titanate (BaTiO) 3 ) Or tantalum pentoxide (Ta) 2 O 5 ) Ethanol dispersion of high refractive index material with nano particle size range of 40-60 nm.
The ink-jet printing equipment can accurately position and print ink on the laser fiber, the positioning accuracy reaches 10 mu m, and the printing of different patterns with different areas can be realized through programming.
The photoluminescence test system has the positioning precision of 10 mu m, can position the laser fiber at high precision and carry out spectrum acquisition.
When external light is pumped, the gain medium in the laser fiber absorbs the energy of the pump light, the emitted fluorescence is totally reflected for multiple times in the inner boundary of the microfiber to realize gain, and laser is emitted finally; the nanoparticle ink is printed on the laser fiber in a high-precision positioning mode, and when the surface of the laser fiber is covered with nanoparticles, the nanoparticles increase the refractive index of a laser microcavity, so that the distance between TE and TM modes of laser emitted by the laser fiber is increased. With the increasing number of ink-jet times of 0 to 4, the wavelength interval between TE and TM modes of the laser gradually increases. Defining that the wavelength difference between the TE mode and the TM mode is 1 when the wavelength difference is more than or equal to 0.5nm and 0 when the wavelength difference is less than 0.5nm, obtaining a pattern printed on the laser fiber by accurately positioning and reading an emergent spectrum on the laser fiber, converting the pattern into a binary digit array, and comparing the binary digit array with preset information to realize an encryption anti-counterfeiting function.
The invention has the following beneficial effects:
the flexible anti-counterfeiting label based on the organic polymer echo wall laser fiber utilizes the changed characteristic of a laser mode to store and write encryption information, has good encryption effect and high imitation difficulty; the flexibility characteristic of the anti-counterfeiting label can be applied to anti-counterfeiting of various commodity packaging boxes.
The high-precision ink-jet printing equipment can realize personalized printing through programming, so that the laser fiber anti-counterfeiting label with a small area can carry a large amount of information, and the information storage capacity is improved.
Drawings
FIG. 1 is a process for making a flexible information storage tag based on an organic polymer whispering gallery laser fiber;
wherein, 1.1, glass substrate, 1.2, organic polymer echo wall laser fiber, 1.3, ink-jet printing nozzle, 1.4, ink drop printed on the fiber by ink-jet printing, 1.5, PDMS dripped on the substrate, 1.6, tiO distributed on the fiber 2 A nanoparticle;
FIG. 2 is a schematic representation of a high precision positional inkjet printing experiment on a laser fiber according to the present invention;
2.1, a pump light source, 2.2, a focusing objective lens, 2.3, a laser fiber sample, 2.4, a beam splitter, 2.5, a CCD camera, 2.6, a spectrometer, 2.7, incident light, 2.8 and emergent light;
FIG. 3 is a laser spectrum of a laser fiber having a diameter of 40 μm according to the present invention when ink-jetting is performed on the surface thereof for 0 to 4 times;
when the ink jetting times on the surfaces of the microfibers are 0,1,2,3,4, the wavelength intervals of the TE mode and the TM mode of the laser spectrum are 0.277nm,0.401nm,0.606nm,0.739nm and 0.889nm respectively, and the code units are defined as '0' and '1'.
FIG. 4 is a process of reading the information stored on the fiber in the present invention by performing laser spectrum tests on different positions of the fiber, then calculating the spacing between adjacent TE and TM modes of the spectrum, converting the spacing into coding units "0" and "1" by definition, and finally decoding the encrypted information "BJUT" from the ASCII code.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
An organic polymer echo wall laser fiber flexible label for information storage is manufactured by the following steps:
placing a polyvinyl alcohol echo wall laser fiber doped with a laser gain medium RhB on the surface of a glass substrate of 1.5cm multiplied by 1 cm;
adding TiO into the mixture 2 The nanoparticles were dispersed in ethanol to form 0.02mg/mL TiO 2 The nano-particle dispersion liquid is used as ink for ink-jet printing; presetting a printing area to be 1.5cm multiplied by 1.5cm, and dividing the printing area into 4 multiplied by 7 series; selecting an ink-jet printing nozzle with the aperture of 60 mu m, and taking a proper amount of ink to perform ink-jet printing on the laser fiber;
a nanosecond laser (repetition frequency 10Hz, pulse width 1 ns) with a wavelength of 532 was used as pump light to irradiate the printing region of the organic polymer laser fiber. Accurately positioning and testing through a photoluminescence testing system to obtain emergent spectra of different positions in a printing area;
calculating the wavelength distance between TE mode and TM mode of emergent spectrum, arranging them into 4 × 7 binary series according to coding units of '0' and '1', decoding the information 'BJUT' stored on the fiber according to converted ASCII code, and comparing with preset information.
The invention provides a flexible anti-counterfeiting label based on organic polymer echo wall laser fiber, and the above description is the basic principle and the main manufacturing method of the invention, but not limited to the laser gain medium RhB and the nano-particle TiO mentioned in the invention 2 Ink jet printing methods and encryption and decoding rules, other methods for patterning laser fibers, and other laser gain media and organic polymers to adjust the TE and TM mode wavelength spacing of the laser emission spectra are within the scope of the present invention.

Claims (9)

1. An organic polymer echo wall laser fiber flexible label for information storage, characterized in that: the device comprises a microfiber organic polymer laser for recording information, a PDMS film for providing a flexible packaging effect, nanoparticle ink for modulating laser fiber outgoing signals, an inkjet printing device for performing anti-counterfeiting coding on laser fibers, and a photoluminescence test system for reading anti-counterfeiting information on the laser fibers; arranging a microfiber organic polymer laser on a glass substrate, printing nanoparticles on the surface of a fiber by an ink-jet printing device to perform anti-counterfeiting coding, dripping PDMS (polydimethylsiloxane) on the surface of the substrate to flexibly package the laser fiber, and finally pumping and reading encrypted information of the laser fiber subjected to ink-jet printing by using a photoluminescence system.
2. An organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the organic polymer material is one of polyvinyl alcohol PVA, polymethyl methacrylate PMMA, polyvinylpyrrolidone PVP, polystyrene PS and epoxy resin, or a mixture of two or more of the two.
3. The organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the laser gain medium is one of 4,4' bis (2-sulfostyryl) biphenyl disodium, fluorescein sodium, rhodamine 6G or rhodamine B.
4. The organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the organic polymer microfibers have a diameter distribution of 20 to 60 μm.
5. An organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the nano-particle ink is an oil-soluble dispersion liquid containing titanium dioxide or barium titanate or zirconium dioxide or tantalum pentoxide high-refractive-index materials, and the size range of nano-particles is 40-60 nm.
6. An organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the ink-jet printing equipment can accurately position and print ink on the laser fiber, the positioning accuracy reaches 10 mu m, and the printing of different patterns with different areas can be realized through programming.
7. An organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: the photoluminescence test system has the positioning accuracy of 10 microns, can position the laser fiber at high accuracy and perform spectrum acquisition.
8. An organic polymer echo wall laser fiber flexible label for information storage according to claim 1, characterized in that: when external light is pumped, the gain medium in the laser fiber absorbs the energy of the pump light, the emitted fluorescence is reflected in the inner boundary of the microfiber for multiple times to realize gain, and finally laser is emitted; the nanoparticle ink is printed on the laser fiber in a high-precision positioning mode, when the surface of the laser fiber is covered with high-refractive-index nanoparticles, the refractive index of the microcavity body is increased by the nanoparticles, so that the wavelength interval between TE and TM modes of laser is increased, and the wavelength interval between the TE and TM modes of a region which is not covered by the nanoparticles is unchanged; with the increasing of ink jet times from 0 to 4, the wavelength interval between TE and TM modes of the laser is gradually increased; defining that the wavelength difference between the TE mode and the TM mode is 1 when the wavelength difference is more than or equal to 0.5nm and 0 when the wavelength difference is less than 0.5nm, obtaining patterns printed on the laser fibers by accurately positioning and reading the emergent spectrum on the laser fibers, converting the patterns into a binary digital array, and comparing the binary digital array with preset anti-counterfeiting information to realize the anti-counterfeiting function.
9. A method for preparing the flexible information storage label based on the organic polymer echo wall laser fiber in claim 1, which is characterized in that: the method comprises the following steps:
(1) Placing the polyvinyl alcohol echo wall laser fiber doped with the laser gain medium RhB on the surface of a glass substrate of 1.5cm multiplied by 1.5 cm;
(2) TiO with the diameter of 60nm 2 The nanoparticles were dispersed in ethanol to form 0.02mg/mL TiO 2 The nano-particle dispersion liquid is used as ink for ink-jet printing; presetting a print pattern to be two-dimensionalCode, presetting a printing area to be 1.5cm multiplied by 1.5cm, and dividing the printing area into 4 multiplied by 7 number arrays; selecting an ink-jet printing nozzle with the aperture of 60 mu m, and taking a proper amount of ink to perform ink-jet printing on the laser fiber;
(3) A nanosecond laser with the wavelength of 532nm is used as pump light to irradiate a printing area of the organic polymer laser fiber; accurately positioning and testing through a photoluminescence testing system to obtain emergent spectra of different positions in a printing area;
(4) The wavelength distance between the TE mode and the TM mode of the emergent spectrum is calculated, the TE mode and the TM mode are arranged into 4 multiplied by 7 binary series according to the coding units of '0' and '1', and the information stored on the fiber is decoded according to the converted ASCII code.
CN202211117945.2A 2022-09-14 2022-09-14 Organic polymer echo wall laser fiber flexible label for information storage Pending CN115578928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211117945.2A CN115578928A (en) 2022-09-14 2022-09-14 Organic polymer echo wall laser fiber flexible label for information storage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211117945.2A CN115578928A (en) 2022-09-14 2022-09-14 Organic polymer echo wall laser fiber flexible label for information storage

Publications (1)

Publication Number Publication Date
CN115578928A true CN115578928A (en) 2023-01-06

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