Terahertz detector integrated with silicon photonic crystal waveguide

Abstract

The invention provides a terahertz detector integrated with a silicon photonic crystal waveguide, and the terahertz detector comprises a two-dimensional photonic crystal flat panel, a gradient coupling input waveguide, a line defect transmission waveguide, a plurality of L3 type photonic microcavities and a plurality of terahertz detectors, wherein the two-dimensional photonic crystal flat panel consists of a plurality of crystal units, crystal lattices on each crystal unit are periodically arranged to form a triangular crystal lattice structure, horizontal crystal lattice constants on different crystal units are different, and vertical crystal lattice constants on the different crystal units are the same, so that horizontal splicing correspondence of crystal unit blocks is kept; each crystal unit is provided with an L3 type photon microcavity, each L3 type photon microcavity is provided with a terahertz detector, the crystal units are connected through a line defect transmission waveguide, and the two-dimensional photonic crystal flat panel is connected with an external input waveguide through the gradient coupling input waveguide. According to the invention, terahertz signals of multiple frequency bands can be detected at the same time.

Description

technical field [0001] The invention relates to terahertz detection technology, in particular to a terahertz detector integrated with a silicon photonic crystal waveguide. Background technique [0002] Terahertz spectrum usually refers to the spectrum region between 0.1THz and 10THz, corresponding to a wavelength of 30-3000μm. Its special spectral position determines its irreplaceable application in biological imaging and high-speed wireless communication. As an indispensable device in the field of terahertz detection, terahertz detectors are still an urgent problem to be solved in the field of terahertz how to make detectors with simple structure and easy integration. Compared with electrons in the medium, terahertz light waves are difficult to confine and store, and the speed is difficult to control. Photonic crystals are expected to solve this problem, allowing people to manipulate light waves in a medium. Photonic crystals are a new type of functional material whose di...

AI Technical Summary

Problems solved by technology

Due to the characteristics of the photonic crystal itself, its design generally only has a single-frequency filter module, which cannot realize coupling filtering in multiple frequency bands; multiple coupling filter modules are combined on the same photonic crystal plate by splicing and usually lose their originality due to lattice mismatch. The function of coupling resonance and filtering of each frequency band

Especially in the terahertz band, the wavelength of the incident terahertz signal is usually above 100 microns, and the size of the photonic crystal waveguide is much larger than that in the optical band, and the terahertz wave has a large attenuation during propagation, which greatly reduces the detection The energy coupled by the detector reduces the sensitivity of the detector

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