Application of amorphous selenium

A technology of amorphous selenium and reaction vessels, which is applied in the synthesis and application of nonlinear optical materials, can solve the problems of low energy conversion rate and narrow band, and achieve the effects of simple preparation process, high stability and good repeatability

Active Publication Date: 2016-11-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, almost all optical second harmonic materials are crystals, and the working band is relatively narrow, and the energy conversion rate is low, so there are great limitations in practical applications.

Method used

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  • Application of amorphous selenium
  • Application of amorphous selenium
  • Application of amorphous selenium

Examples

Experimental program
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Effect test

Embodiment 1

[0042] like figure 1 As shown, in this embodiment, when preparing amorphous selenium, specifically laser 1 (using Ti:sapphire femtosecond pulsed laser, laser wavelength 800nm, pulse width 35fs), total reflection mirror 2, focusing lens 3, solid target material 4 , reaction vessel 5, secondary deionized water 6. Wherein, the pulsed laser frequency of the laser 1 is 1000 Hz, the pulse width is 35 fs, and the single pulse energy is 0-4 mJ; the solid target 4 is a selenium solid target with a diameter of 2 cm, a thickness of 0.5 cm, and a purity greater than 99.99 %; The reaction vessel 5 is a glass or plastic vessel, and in this embodiment is specifically a quartz vessel.

[0043] The following is the specific process of preparing the amorphous selenium particles in this embodiment, and the situation is as follows:

[0044] 1) Place the selenium solid target in a quartz container, then inject secondary deionized water into the quartz container, and let the secondary deionized w...

Embodiment 2

[0050] This embodiment mainly carries out optical second harmonic test to the amorphous selenium particle that embodiment 1 prepares, as Figure 4 As shown, specifically, laser 7 (using Ti:sapphire femtosecond pulse laser, laser wavelength 690-1040nm, pulse width 100fs, repetition frequency 80MHz, output power range 0-2W), partial reflector 8, focusing lens 9 , CCD10, spectrometer 11, condenser objective lens 12, vacuum sample stage 13. Among them, the reflection-transmittance ratio of the partial mirror is 1:1, the condenser objective lens is a confocal microscope objective lens, and the vacuum degree of the sample stage reaches 1.4Torr.

[0051] The following is the specific process of the optical second harmonic performance of the present embodiment testing amorphous selenium particles, and its situation is as follows:

[0052] 1) Place the amorphous selenium particles on a vacuum sample stage, and use a molecular pump to evacuate until the vacuum degree reaches 1.4 Torr.

...

Embodiment 3

[0058] The difference from Example 2 is that this example uses 110mW to excite the selenium particles to obtain the second harmonic signal reflected back, such as Figure 5b As shown, the full width at half maximum of the signal is 3nm; then, we tested the reflection signal of the selenium particles under different powers, the results are as follows Figure 5c As shown, the slope of the straight line obtained by fitting the experimental data is close to 2, which proves that the selenium particles do emit the second harmonic signal under the excitation light. It should be noted that for a single amorphous selenium particle with a diameter of less than 300nm, the second harmonic signal reflected by it has not been detected, and the second harmonic signal can only be detected by the spectrometer when the diameter exceeds 300nm.

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Abstract

The invention discloses an application of amorphous selenium, and in particular, relates to the application of the amorphous selenium as an optical second harmonic material. Amorphous selenium particles with different particle sizes are prepared by using femtosecond laser liquid ablation of a selenium solid target material, single amorphous selenium particle with the particle size of more than 300 nm has the function of generating near infrared optical second harmonic waves, and an amorphous selenium particle dimer with the diameter of about 200 nm also has the optical second harmonic wave function. The amorphous selenium is presented to have the wide-spectral optical second harmonic wave function for the first time, and the field that traditional optical second harmonic materials are all crystals is broken. The preparation process is simple, the repeatability is good, the stability is high and the cost is low. The amorphous selenium is used as a novel optical second harmonic material, and can replace the traditional materials to be applied in biological detection, medical diagnosis, surface detection and other fields.

Description

technical field [0001] The invention relates to the field of synthesis and application of nonlinear optical materials, in particular to the application of amorphous selenium. Background technique [0002] Since the invention of the laser in 1960, the field of nonlinear optics has developed vigorously, and new nonlinear optical materials have been synthesized and widely used in different scientific fields. Among them, the optical second harmonic plays an important role in frequency conversion and surface detection. Because it does not damage materials, it is a commonly used detection technology. However, almost all optical second harmonic materials are crystals with narrow working bands and low energy conversion efficiency, so they have great limitations in practical applications. [0003] Amorphous selenium is a brand-new optical second harmonic material, which has a wide effective range of optical second harmonic and good biocompatibility, so it has potential applications ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02G02F1/355G02F1/37
CPCG02F1/355G02F1/37C01B19/02C01P2004/62
Inventor 杨国伟马楚荣严佳豪
Owner SUN YAT SEN UNIV
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