Abstract
Quantum dot infrared photodetectors (QDIP) have a weak ability to capture light, which limits the further improvement of absorptivity to a certain extent. Since the localized surface plasmon resonance (LSPR) can effectively couple the optical radiation energy and result in a significant field enhancement effect in the near-field range, it is introduced to improve the absorptivity of the QDIP. Concretely, the strip metal grating structure is coupled to the active region of the traditional QDIP, and a metal reflective layer is added at the bottom of the QDIP to improve the absorptivity by using the metal–semiconductor–metal structure. The simulation results show that the addition of the optimized strip metal grating structure can make the photon absorptivity of QDIP reach more than 90% in both frequency bands of 37.5 and 48.5 THz, and the coupling characteristics of LSPR are studied by the analysis of the electric field distribution of QDIP, which can provide the theoretical guidance for the combination of metal grating and traditional QDIP.
Highlights
The material used for the metal grating is gold
The influence of the metal grating on the absorptivity of Quantum dot infrared photodetectors (QDIP) according to the analysis of the local electric field and the overall electric field of the QDIP based on the optical properties are discussed
The addition of a rectangular metal grating structure can greatly improve the performance of traditional QDIP
Summary
As one of the most important optoelectronic devices, photodetectors have aroused great research interest in the past few decades It can absorb photons and convert them into electrical signals and is a core component widely used in search and rescue detection, optical vision, infrared remote sensing, etc.. The quantum dot infrared detector (QDIP) has received more and more attention in recent years due to its excellent light response characteristics and the advantages of device miniaturization.. The quantum dot infrared detector (QDIP) has received more and more attention in recent years due to its excellent light response characteristics and the advantages of device miniaturization.4 It realizes the detection of the incident infrared light by the transition between inter-subbands, so it shows high photoconductive gain, the big responsivity, and so on. It can be found the QDIP is not perfect, it has some negative factors, for example, the influence of the lattice mismatch of the materials and the limited number of the quantum dots stack, and the traditional flat QDIP can only excite simple cavity resonance modes, and its ability to capture light is weak, which limits the further improvement of the absorptivity of the QDIP and other performance indicators to a certain extent. localized surface plasmon resonance (LSPR) can effectively couple and bind the optical radiation energy to the metal surface and result in a significant field enhancement effect in the near-field range. The surface plasmon grating formed based on the metal periodic structure can flexibly design the resonance wavelength while using the near-field enhancement effect. With the in-depth study of surface plasmon theory and the successful production of devices with various structures, it has great potential for applications in various fields of optics, especially in solving some problems that have not been solved by optics for a long time, including the enhanced transmission effect of metal sub-wavelength structure in the fields of super-resolution nanolithography, high-density data storage, and near-field optics.
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