Optimization method of response ratio of one-dimensional T-Hz quantum well photoelectric detector

Abstract

The invention relates to an optimization method of response ratio of a one-dimensional T-Hz quantum well photoelectric detector, which comprises the following steps of: 1, simulating light field distribution of having the diffraction by T-Hz light normally entering the surface of an element when entering the element after passing through an optical grating, and computing a wavelength Lambda of a primary diffraction die vertical to the surface direction of the element; and 2, thinning a substrate of the element within a range allowed by mechanical properties of the element to ensure that the total thickness of the element is integer multiples of the wavelength Lambda. The method realizes the optimal distribution of a light field in the element by grinding, polishing and corroding the substrate of the element, and can ensure a plurality of quantum wells are in a region with stronger light field by reasonably designing the thickness of an upper electrode layer and properly adding the layer number of the quantum wells, thereby improving the performance of the element, optimizing the response rate, and having important meaning on the research and the implementation of THz real-time imaging.

Description

technical field [0001] The invention relates to a method for improving the working performance of a terahertz quantum well photodetector, especially a method for optimizing the responsivity of a one-dimensional grating terahertz quantum well photodetector. The invention belongs to the technical field of semiconductor optoelectronic devices. Background technique [0002] Terahertz (THz) wave refers to the frequency in the electromagnetic spectrum from 100GHz to 30THz (1THz=10 12 Hz), the corresponding wavelength is from 3 millimeters to 10 micrometers, which is the region of the electromagnetic spectrum between millimeter waves and infrared light. For a long time, due to the lack of efficient THz sources and high-sensitivity detection methods, this spectral region has become the only underdeveloped region in the entire electromagnetic spectrum. [0003] One of the core components of the application of THz technology is the THz detector. At present, the relatively mature TH...

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Problems solved by technology

However, according to quantum mechanics, the selection rule of ISBT determines that this type of detector can only detect the polarization component parallel to the growth direction (z direction) of the quantum well in the light field.

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