Double-linear track detecting method of refraction effect of two-dimensional photonic quasi-crystal wedge lens
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A technology of wedge-shaped prism and photon quasicrystal, which is applied in testing optical performance and other directions, and can solve problems such as inaccurate detection of refraction angle
Inactive Publication Date: 2014-12-10
HARBIN INST OF TECH
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[0007] In order to better solve the problem that the detector cannot accurately detect the refraction angle along a single semicircular or linear track, the present invention provides a dual linear track detection method for detecting the refraction effect of a two-dimensional photonic quasicrystal wedge prism
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specific Embodiment approach 1
[0023] Specific implementation mode 1: For the specific detection principle of the dual linear track detection method in this embodiment, see Figure 4 .
[0024] like Figure 4 As shown, let the midpoints of the hypotenuse of the wedge prism and the two linear tracks be respectively , , , and set as the origin of their respective coordinate systems, and the three points are collinear. The detector detects at different positions on the linear track, and each position can detect the intensity value, and the intensity curve formed by all the intensity values, the peak value is the maximum intensity. Suppose the positions of the intensity maximum values detected by the two detectors on the two orbits are respectively , , the distances between the two tracks and the hypotenuse of the prism are respectively , , the direction of the outgoing beam can be obtained, that is, the refraction angle is:
[0025] (1);
[0026] When the refraction is negative, , ; f...
specific Embodiment approach 2
[0036] Embodiment 2: In order to verify the inventive effect of the present invention, this embodiment combines the finite difference time domain method to calculate electromagnetic wave transmission and its field distribution, and specifically examines the refraction effect of a two-dimensional photonic quasicrystal wedge prism. according to figure 1 and figure 2 The size of the wedge prism involved in , assuming that the detection width of the detector 1 and the detector 2 (that is, the length of the straight track) is . In order to make the conclusion of refraction effect more universal, two polarization modes of electromagnetic waves are considered, namely TE mode and TM mode. Provided , grid size for orientation ,Time Step ( is the speed of light in vacuum), and the light transmission time in both TE and TM modes is (starting from the simulation area boundary).
[0037] In order to study the refraction effect in a wedge prism, it is necessary to investig...
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Abstract
The invention provides a double-linear track detecting method of a refraction effect of a two-dimensional photonic quasi-crystal wedge lens, which relates to a double-linear track detecting method. According to the invention, the double-linear track detecting method comprises the following steps of: arranging two linear tracks parallel to a bevel edge of the two-dimensional photonic quasi-crystal wedge lens; and according to opposite positions of the two tracks and the bevel edge as well as maximum strength positions detected on the two tracks, determining a refraction angle and effective index of a refracted beam as well as an emission position and emission position offset of the refracted beam through a geometrical relationship and a refraction law, so as to determine the refraction effect of the two-dimensional photonic quasi-crystal wedge lens. The double-linear track detecting method provided by the invention can be applied to any electromagnetic wave and any two-dimensional N-fold quasi-crystal wedge lens. The double-linear track detecting method provided by the invention is suitable for the field of photonic crystals, in particular photonic quasi-crystals. Meanwhile, according to the invention, a problem that the refraction angle and the effective index cannot be accurately detected or calculated by the traditional single circular arc track detecting method is also solved.
Description
technical field [0001] The invention relates to a double-line track detection method, in particular to a double-line track detection method suitable for detecting or calculating the refraction effect of any two-dimensional photon quasicrystal wedge prism. Background technique [0002] The refraction effect is the deflection effect (including positive refraction and negative refraction) produced by electromagnetic materials or devices on incident electromagnetic waves (or light waves). In two-dimensional photonic quasicrystal devices (such as lenses and prisms), as an important parameter to determine the deflection behavior of incident beams, the equivalent refractive index (including positive and negative refractive indices) determines the specific direction of beam transmission and exit , the specific position of beam focusing and imaging. Therefore, the calculation of the equivalent refractive index is an important topic in the study of the refraction effect in two-dimens...
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