Optical performance enhancement of a blocked-impurity-band photodetector integrated with terahertz metalenes

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-01-16 DOI:10.1016/j.mseb.2025.118010

Feifei Lu , Lianfei Yao , Chixian Liu , Jingwei Ling , Huiyong Deng

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Abstract

The terahertz (THz) band is widely utilized in space exploration. However, the size of traditional THz detectors impedes their integration into focal plane arrays (FPAs). Advances in metasurface technology have enabled the miniaturization and large-scale integration of THz FPAs. This study demonstrates the integration of a high-resistance silicon metalens with a germanium (Ge)-based blocked-impurity-band (BIB) detector. The metalens, featuring high transmittance, focuses THz light onto a compact photosensitive element, significantly enhancing performance. The focused spot size approaches the diffraction limit, with an average focusing efficiency of 42.22 %. A 3 × 3 metalenses array exhibits excellent optical crosstalk, averaging only 1.2 %. Integration with the metalens reduces the size of the Ge-based BIB detector’s photosensitive element to 153.85 μm, achieving an absorptance of 10.12 %, which is 30.35 times higher than that without the metalens. The ultra-thin metalens promotes the miniaturization of BIB detectors, facilitating their large-scale integration into FPAs.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.