3results about How to "Diffraction suppression" patented technology

The utility model relates to an optical waveguide structure, which comprises a glass substrate, an optical waveguide layer and a filling layer, the optical waveguide layer is composed of a thinned wafer, the refractive index of the optical waveguide layer is higher than that of the glass substrate and that of the filling layer, and the optical waveguide layer is arranged on the glass substrate in a bonding manner. The optical waveguide layer is arranged on the glass substrate, the surface, away from the glass substrate, of the optical waveguide layer is provided with an etching grating structure, the filling layer is embedded in an etching gap of the etching grating structure, the outer side surface of the filling layer and the outer side surface of the etching grating structure are approximately located on the same plane, and / or the filling layer covers the outer side surface of the etching grating structure. According to the utility model, the glass substrate is used as the optical waveguide substrate, the bonded and thinned high refractive index wafer is used as the optical waveguide layer so as to form the predetermined etching grating structure, and the filling layer with the lower refractive index is used for filling the etching gap of the etching grating structure, so that the light emitting efficiency is improved, the coupling-out uniformity is ensured, and the rainbow pattern is reduced; the method has the advantages of stable process and easy mass production, and is suitable for large-batch process production.

The invention discloses an anti-diffraction super-resolution lensless imaging method based on a random coding mask, belongs to the technical field of computational imaging, and aims to solve the problems in the prior art. Obtaining a point spread function (PSF) of the lens-free imaging system on the image sensor; establishing a general regularization equation according to the collected aliasing image and a calibrated point spread function (PSF); splitting the regularization equation; adding an activation function into the split regularization equation to obtain an improved regularization equation; solving the regularization equation to obtain an unknown number analytic expression and a hyper-parameter analytic expression; substituting the Fourier expression into the unknown number analytic expression and the hyper-parameter analytic expression in an operator form to obtain the unknown number analytic expression and the hyper-parameter analytic expression in the Fourier form; and substituting an aliasing image directly acquired by the lensless imaging system and a point spread function (PSF) of the system into the unknown number analytic expression and the hyper-parameter analytic expression, and iteratively calculating each unknown number and hyper-parameter until convergence.

This invention discloses a horizontally symmetry-axis-weighted interdigitated surface acoustic wave (SAW) Morlet wavelet processor and processing system, belonging to the technical field of SAW wavelet transform processors. The SAW Morlet wavelet processor includes a piezoelectric substrate and transmitting and receiving transducers integrated at both ends of the piezoelectric substrate. The transmitting transducer converts the received input signal into a SAW wavelet transform signal propagating along the surface of the piezoelectric substrate. The receiving transducer receives the SAW wavelet transform signal and converts it into an electrical wavelet transform signal for output. The length of the horizontal symmetry axis of each interdigitator is proportional to the envelope amplitude of the Morlet binary wavelet function, and the acoustic aperture is greater than or equal to the wavelength of the SAW wave. This invention can efficiently suppress diffraction phenomena, achieving a comprehensive performance improvement and providing strong support for technological upgrading and innovative development in various fields.