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Surface plasma-based quantum dot random laser and preparation method thereof

A surface plasmon and random laser technology, applied in the field of lasers, can solve the problems of fluorescence quenching, random laser emission efficiency reduction, etc., to enhance local field strength, prevent fluorescence quenching, increase stimulated absorption and stimulated The effect of radiation rate

Active Publication Date: 2018-06-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method of contacting quantum dots with metal nanoparticles inevitably leads to fluorescence quenching, which reduces the emission efficiency of random lasers.

Method used

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  • Surface plasma-based quantum dot random laser and preparation method thereof
  • Surface plasma-based quantum dot random laser and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of quantum dot random laser based on surface plasmon, such as figure 1 As shown, it includes a first glass substrate 1 , a PVA spacer layer 4 , Ag nanoparticles 7 and a second glass substrate 2 stacked in sequence.

[0022] Several parallel micron-scale grooves 3 are arranged on the inner surface of the first glass substrate 1. CdSe / SnS quantum dots are deposited in these grooves 3. The width of the grooves 3 is 80 μm, the depth is 45 μm, and the interval is 1 mm.

[0023] Ag nanoparticles 7 are fixed on the inner surface of the second glass substrate 2, and the PVA spacer layer 4 is located between the Ag nanoparticles 7 and the CdSe / SnS quantum dots, with a thickness of 40nm.

[0024] The specific operation of the preparation method of the above-mentioned laser is as follows:

[0025] (1) On the first glass substrate 1, micron-scale grooves 3 are etched with diamond, and CdSe / SnS quantum dots are deposited in the grooves 3 by spin coating, and th...

Embodiment 2

[0030] Embodiment 2: roughly the same as Embodiment 1, the difference is that the quantum dots are selected from CdSe / CdS quantum dots, the metal nanoparticles are Au nanoparticles, the width of the groove 3 is 40 μm, the depth is 30 μm, the interval is 2mm, and the spacer layer 4 The material is PMMA, the thickness is 15nm. During the preparation process, the spin-coating speed of the quantum dots 4 was 200rpm / 120s, the second glass substrate 2 was silanized with APTMS for 2h, rinsed and dried, then immersed in the colloidal suspension of Au nanoparticles 7 for 1h, the PMMA spacer layer 4 The spin coating speed was 5000 rpm.

Embodiment 3

[0031] Embodiment 3: roughly the same as Embodiment 1, the difference is that the quantum dots are selected from CdSe / SnS quantum dots, the metal nanoparticles are Ag nanoparticles, the width of the groove 3 is 120 μm, the depth is 60 μm, the interval is 3mm, and the spacer layer 4 The material is PMMA, and the thickness is 70nm. During the preparation process, the spin-coating speed of the quantum dots 4 was 400rpm / l20s, the second glass substrate 2 was silanized with APTMS for 4h, rinsed and dried, then immersed in the colloidal suspension of Ag nanoparticles 7 for 4h, the PMMA spacer layer 4 The spin coating speed was 2000 rpm.

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Abstract

The invention provides a surface plasma-based quantum dot random laser. The surface plasma-based quantum dot random laser comprises a first glass substrate, a spacer layer and a second glass substratewhich are stacked sequentially; a micro-grade groove is formed in the surface, fit with the spacer layer, of the first glass substrate and is used for quantum dots to deposit; and the spacer layer contains metal nanoparticles fixed on the second glass substrate, and distance between the metal nanoparticles and the quantum dots is controlled. The surface plasma resonance effect of the metal nanoparticles enhances the excitation efficiency of pump light and the radiation efficiency of random laser; meanwhile, the spacer layer effectively avoids fluorescence quenching phenomenon generated by contact of the quantum dots and the metal nanoparticles; furthermore, the spacer layer material adopts a transparent macromolecular polymer, the resonance adsorption spectrum of the metal nanoparticles is subjected to red shift, and coupling between a surface plasma resonance band and an excitation spectrum as well as between the surface plasma resonance band and an outgoing spectrum is realized, sothat stable and random laser with low threshold value and high intensity is obtained to be emergent.

Description

technical field [0001] The invention relates to a laser, in particular to a random laser and a preparation method thereof. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. There are many significant differences between random lasers and traditional lasers in terms of generation mechanism and luminescence characteristics. Random laser radiation originates from activated disordered media, and provides optical feedback through multiple scattering of radiated light in the media, thereby obtaining greater gain without Additional resonator. Benefiting from the quantum confinement effect, colloidal quantum dots (CQDs) have some irreplaceable advantages as laser materials, namely broad excitation spectrum, tunable emission wavelength, high quantum yield, good color purity, and temperature-insensitive laser performance . Quantum dot random lasers can act as a gain medium because the quantum dot mate...

Claims

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Application Information

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IPC IPC(8): H01S3/10
CPCH01S3/10
Inventor 叶莉华赵庆程志祥徐淑宏崔一平
Owner SOUTHEAST UNIV
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