Room-temperature optical excitation zinc oxide phonon vibrating terahertz laser

A terahertz and laser technology, applied in the field of terahertz lasers, to achieve the effects of low material cost, simple and easy experimental conditions, and non-toxic material cost

Active Publication Date: 2021-03-26
NANJING UNIV
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Problems solved by technology

How to prepare a THz source that satisfies room temperature operation, high-frequency long-wavelength radiation, and has the advantages of power and conversion efficiency as high as possible is still a challenge

Method used

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  • Room-temperature optical excitation zinc oxide phonon vibrating terahertz laser
  • Room-temperature optical excitation zinc oxide phonon vibrating terahertz laser
  • Room-temperature optical excitation zinc oxide phonon vibrating terahertz laser

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Embodiment

[0047] The first step is to prepare self-assembled zinc oxide mesomorphic microspheres: 0.002 mol (0.59 g) zinc nitrate hexahydrate Zn(NO3) 6H2O and 5 ml sodium polystyrene sulfonate (PSS, average molecular weight M W ≈ 100 000 gmol -1 , solid content: 20%) were dissolved in 30 ml of deionized water and stirred for 5 minutes. Then 0.002 mol (0.28 g) of hexamethyltetrammine (HMT) was added into the solution and stirred for 10 minutes. Pour the above-prepared solution into a 35 ml polytetrafluoroethylene-lined hydrothermal kettle, tighten the lid of the kettle and place it in a resistance oven, and react at a temperature of 95°C for 3-10 hours. After the reaction was completed, the hydrothermal kettle was taken out and cooled naturally at room temperature. Remove the supernatant clear solution in the reaction solution, then pour the precipitate into a centrifuge tube and add deionized water and ethanol solution for repeated washing and centrifugation. Put the washed sediment ...

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Abstract

The invention discloses a terahertz laser based on phonon vibration excitation. The terahertz laser comprises a resonant cavity, wherein the resonant cavity is formed by a hollow waveguide tube made of Ag / a flexible supporting layer / a ZnO film and optical lenses arranged at the two ends of the waveguide tube, and M represents nano metal particles. Zinc oxide mesocrystal microspheres are used as asource, symmetrical telescopic vibration of nanosheets on the zinc oxide microspheres is induced through laser excitation, terahertz waves with the frequency of 0.36 THz are radiated in a phonon vibration mode through elasticity and electric coupling propagation between the nanosheets, meanwhile, the zinc oxide mesocrystal microspheres and nano metal particles are evenly mixed, a Raman effect is enhanced by utilizing the surfaces of the nano metal particles, a strong local electric field is generated at a few nanometers near the surfaces of the particles, and the polarizability of the ZnO mesocrystal microsphere cantilever nanosheet is greatly changed through the full contact of the nano-metal particles and the ZnO mesocrystal microspheres, so that the terahertz radiation power of the ZnOmesocrystal microsphere cantilever nanosheet is enhanced.

Description

technical field [0001] The invention belongs to the field of terahertz lasers, and relates to a terahertz laser that radiates terahertz waves in the form of phonon vibration to realize the output of long-wavelength terahertz signals at room temperature. Background technique [0002] The terahertz (THz) region of the electromagnetic spectrum has a frequency range of 0.1 to 10 THz, between the infrared band and the microwave band. People have developed relatively mature technologies related to infrared waves and microwaves, but the THz waves between them are incompatible with these technologies, and people call it the THz gap (THz Gap) (B. Ferguson et al. , Nat. Mater. 2002, 1, 26–33). However, THz waves have strong penetrability, low energy, and little biological damage, and can be used in many fields such as semiconductors, medical care, manufacturing, and defense industries. Therefore, in recent decades, THz wave is one of the fastest-growing spectral regions, and peopl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S4/00B82Y30/00B82Y40/00B82Y20/00
CPCB82Y20/00B82Y30/00B82Y40/00H01S4/00H01S3/0078H01S3/063H01S3/094038H01S3/1628H01S3/169H01S3/30H01S2302/02G01N21/65H01S3/08077H01S3/09H01S3/091H01S3/09403H01S3/0943H01S3/1086H01S5/042H01S5/2214
Inventor 吴兴龙杨润汪毅贤沈剑沧
Owner NANJING UNIV
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