All-semiconductor mid-infrared tunable absorber

Abstract

The invention provides an infrared adjustable frequency absorber in an all-semiconductor. The infrared adjustable frequency absorber comprises a rectangular n(p)-type doped semiconductor layer, two first bias control parts which are manufactured on opposite sides of the n(p)-type doped semiconductor layer, an intrinsic semiconductor dielectric isolation layer which is manufactured on the n(p)-type doped semiconductor layer, a number of n(p)-type doped semiconductor grating strips which form a grating layer, and two second bias control parts which are manufactured on both ends of the n(p)-type doped semiconductor grating strips on the intrinsic semiconductor dielectric isolation layer. The length of the intrinsic semiconductor dielectric isolation layer is less than the distance between two first bias control parts. The strips share the same width. Each two n(p)-type doped semiconductor grating strips form a group, wherein the width of one strip is smaller than the width of the other strip. A number of n(p)-type doped semiconductor grating strips are longitudinally manufactured on the intrinsic semiconductor dielectric isolation layer. The n(p)-type doped semiconductor grating strips excite a surface plasmon mode.

Description

technical field [0001] The invention relates to an all-semiconductor mid-infrared frequency-tunable absorber, in particular to an all-semiconductor ultra-thin sub-wavelength mid-infrared absorber capable of realizing frequency modulation. Background technique [0002] In the electromagnetic spectrum, the spectral interval with a wavelength range of 2.5-25 microns is usually called the mid-infrared spectral region. Mid-infrared is also known as thermal infrared or emission infrared, which can be used for night-time infrared scanning imaging. In addition, the fundamental frequency absorption bands of most organic and inorganic substances appear in the mid-infrared region. Mid-infrared absorbers can be used as absorbing elements for thermal detectors / emitters, or as coating materials to reduce spurious emissions of electromagnetic waves. Therefore, it is of great significance to study the properties of materials in the mid-infrared band. [0003] In recent years, perfect abs...

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Problems solved by technology

However, these studies mainly focus on microwave, terahertz, and near-infrared bands, and tunable absorbers working in the mid-infrared band are rarely reported.

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