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PT symmetric Cantor photonic crystal structure capable of realizing coherent absorption laser points

A photonic crystal and coherent absorption technology, which is applied in the field of all-optical communication systems, can solve the problems of more dielectric layers, difficulty in reducing the structure size, and difficulty in manufacturing, and achieve the effect of simplifying the system structure

Inactive Publication Date: 2021-12-14
HUBEI UNIV OF SCI & TECH
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Problems solved by technology

This type of optical amplifier requires more dielectric layers, making it more difficult to manufacture, and it is not easy to reduce the size of the structure

Method used

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  • PT symmetric Cantor photonic crystal structure capable of realizing coherent absorption laser points
  • PT symmetric Cantor photonic crystal structure capable of realizing coherent absorption laser points
  • PT symmetric Cantor photonic crystal structure capable of realizing coherent absorption laser points

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specific Embodiment

[0040] Specific embodiments: (respectively in conjunction with the accompanying drawings to specifically illustrate the implementation process of this method, if necessary, an example of using this method can be provided, the more detailed this part, the better)

[0041] Such as figure 2 As shown in (a), when the gain-loss factor is q=0.01, the incident angle corresponding to CAP-LP is θ =30.45°, the normalized frequency is ( ω − ω 0 ) / ω gap =0.474, the reflectance is R LP =1.03×10 5 , the transmittance is T LP =3.23×10 4 . And the normalized frequency ( ω − ω 0 ) / ω gap =0.474 corresponds to a wavelength of λ=1.1749μm, that is, when the incident angle satisfies θ =30.45°, the photonic crystal is stimulated to emit laser light, and the output wavelength of the laser is λ=1.1749μm.

[0042] If you want to change the output wavelength of the laser, it can be achieved by changing the gain-loss coefficient q, such as image 3 (a) shown. For example, when ...

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Abstract

The invention discloses a PT symmetric Cantor photonic crystal structure capable of realizing coherent absorption laser points. Two uniform dielectric sheets with different refractive indexes meet the arrangement of Cantor photonic crystals with a sequence number N of 3. The iteration rules of the Cantor sequence are that: S0 = A, S1 = ABA, S2 = ABABBBABA, S3 = S2 (3B) 2S2,..., SN = SN-1 (3B) N-1SN-1,...; the refractive indexes of materials in the dielectric sheets are modulated, so that the material refractive index of the whole structure meets the PT symmetry condition that n (z) = n * (-z); coherent perfect absorption laser points with different wavelengths can be obtained by regulating and controlling the incident angle of light waves and the gain loss coefficient in the PT symmetric Cantor photonic crystal. The coherent perfect absorption laser points can be used for manufacturing a laser, and the working wavelength of the laser can be flexibly regulated and controlled through a gain-loss factor. The structure has the advantages of improved light amplification factor, reduced structural size and the like.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication systems, and relates to a PT symmetrical Cantor photonic crystal structure capable of realizing coherent perfect absorption of laser points. Background technique [0002] Lasers are widely used in various technical fields. For example, in all-optical communication, most of the light sources at the transmitting end use semiconductor lasers; in the link of optical fiber communication, fiber amplifiers are required for signal relay; in the medical field , the wavelength needs to be changed, and a fiber laser is used. [0003] The core component of a laser is an optical amplifier, and common optical amplifiers include semiconductor optical amplifiers. Under the action of pump light, the impurity-doped dielectric pumps the electrons from the ground state to the excited state, thereby realizing the inversion of the number of ions. The medium that realizes the inversion of the number ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00C30B29/46C30B29/22
CPCG02B1/005C30B29/22C30B29/46
Inventor 赵东
Owner HUBEI UNIV OF SCI & TECH
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