Dispersion compensation waveguide
A technology of dispersion compensation and compensation wave, applied in the directions of optical waveguides, light guides, instruments, etc., can solve the problems of uneven color ratio, affecting the image imaging effect, etc.
Active Publication Date: 2021-12-10
HANGZHOU INST FOR ADVANCED STUDY UCAS
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Problems solved by technology
The positions of the light exit points of different wavelengths are distributed along the axis, resulting in a "rainbow phenomenon" with uneven axial color ratios, which affects the imaging effect of the image
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[0047] Such as image 3 As shown, the light rays a, b, and c transmitted in the waveguide are red light with a wavelength of 650nm, green light with a wavelength of 550nm, and blue light with a wavelength of 450nm. The central waveguide 11 and the compensation waveguides 121 and 122 use titanium oxide, silicon nitride, and aluminum oxide with refractive indices of 2.30, 2.00, and 1.70, respectively. Red light, green light, and blue light enter the central waveguide 11 at incident angles of 65°, 55°, and 45°, respectively.
[0048] At the interface between the central waveguide 11 and the compensation waveguide 121, the critical angle at which total reflection occurs: Then the red light satisfies the total reflection condition, and total reflection occurs at point A; the green light and blue light do not satisfy the total reflection condition, and are transmitted from the central waveguide into the compensation waveguide 121 in the dispersion compensation unit. The angle of r...
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Abstract
The invention discloses a dispersion compensation waveguide which comprises a central waveguide serving as a substrate and dispersion compensation units on the two sides. And the dispersion compensation unit is formed by stacking a plurality of layers of waveguides with different refractive indexes and sizes. Incident light with different wavelengths is incident to the central waveguide at different angles, so that different optical paths exist in the dispersion compensation waveguide; however, the total reflection times in the waveguide are the same, and incidence points of light with different wavelengths entering the central waveguide after total reflection are the same, so that dispersion-free transmission is realized. The dispersion compensation waveguide has the advantages that the axial size of the waveguide is not additionally increased, the additional radial size is small, the preparation cost is low, the dispersion compensation waveguide can be easily combined with a pupil expanding structure to increase the moving orbit range and the total light emitting area of human eyes, and the used waveguide structure has the characteristics of lightness, thinness and high transmittance; the waveguide can be applied to an augmented display wearable device (such as an augmented reality near-eye display device).
Description
technical field [0001] The invention relates to the field of light and image transmission, in particular to a dispersion compensation waveguide, which can be applied to fields such as wearable devices, communication, and sensing. Background technique [0002] Waveguide is a common structure that guides the transmission of electromagnetic waves, and it is widely used in wearable devices, optoelectronic communication, sensing and detection and other fields. Limiting the transmission of light in the waveguide structure needs to meet the conditions of total reflection of light, that is, the refractive index of the waveguide structure is greater than that of the surrounding medium and the incident angle is greater than the critical angle. At present, the loss, dispersion and nonlinear effects of waveguide are the main restrictive factors hindering the improvement of waveguide transmission performance. Monochromatic light of different wavelengths will have different total reflect...
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IPC IPC(8): G02B6/12G02B6/13G02B27/01
CPCG02B6/12004G02B6/13G02B27/0101
Inventor 杨陈楹温俊仁
Owner HANGZHOU INST FOR ADVANCED STUDY UCAS