VẬT LIỆU BIẾN HÓA HẤP THỤ ĐA ĐỈNH VÀ DẢI RỘNG BỞI CẤU TRÚC ĐĨA TRÒN TRONG VÙNG KHẢ KIẾN=MULTIBAND AND BROADBAND METAMATERIAL ABSORBER BASED ON DISK-SHAPED RESONATORS IN VISIBLE REGION

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Tác giả: Hữu Nguyên Bùi, Quỳnh Anh Hồ, Đắc Tuyên Vũ Thị Hồng Hạnh Lê, Thị Hậu Nguyễn, Bá Tuấn Tống, Đình Lãm Vũ, Thị Hồng Hạnh Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.421 - 427

Bộ sưu tập: Metadata

ID: 480615

Thêm vào giỏ

Metamaterial absorbers have demonstrated significant potential in electromagnetic wave shielding, sensing and energy harvesting. Finding metamaterial that can absorb electromagnetic wave is not only simple design and fabrication, but also has multi-peak, wide-band absorption still in progress. This study presents an effective method to expand the absorption bandwidth of metamaterial absorbers in visible region. The proposed metamaterial absorber consists of periodic metallic disk structure on the top and continuous metallic plane on the bottom separated by a dielectric substrate. The absorption properties were investigated and simulated using commercial software CST Microwave Studio (Computer Simulation Technology) based on finite integration technique (FIT). The results show that the near-field coupling leads to absorption characteristics. By optimizing the asymmetrical arrangement of two disk-shaped resonators, the absorption bandwidth can be expanded from 387.6 to 579.5 THz (wavelength 518 - 774 nm) with absorptivity over 80%. The absorption mechanism is explained by induced current distribution, electric distribution and near-field coupling. This work proposes a simple and effective method to create multi-peak, broadband absorption using metamaterials with facile structure.Vật liệu biến hóa hấp thụ sóng điện từ đã chứng tỏ tiềm năng quan trọng trong việc che chắn sóng điện từ, làm cảm biến và chuyển đổi năng lượng. Việc tìm ra vật liệu biến hóa hấp thụ sóng điện từ không chỉ đơn giản về thiết kế và chế tạo đồng thời hấp thụ đa đỉnh, dải rộng đang được quan tâm thực hiện. Nghiên cứu này giới thiệu một phương pháp hiệu quả mở rộng dải hấp thụ sóng điện từ của vật liệu biến hóa trong vùng ánh sáng nhìn thấy. Vật liệu biến hóa đề xuất gồm cấu trúc đĩa kim loại tuần hoàn ở mặt trên và tấm kim loại liên tục mặt dưới được ngăn cách bởi lớp điện môi. Tính chất hấp thụ được khảo sát và mô phỏng bằng phần mềm thương mại CST Microwave Studio (Computer Simulation Technology) dựa trên kỹ thuật tích phân hữu hạn (FIT). Kết quả cho thấy hiệu ứng tương tác trường gần có thể làm thay đổi đặc tính hấp thụ. Bằng cách tối ưu vị trí sắp xếp không đối xứng hai đĩa kim loại, dải hấp thụ có thể được mở rộng từ 387,6 đến 579,5 THz (bước sóng 518 - 774 nm) với độ hấp thụ trên 80%. Cơ chế hấp thụ được giải thích dựa trên phân bố dòng điện cảm ứng, phân bố điện trường và hiệu ứng tương tác trường gần. Báo cáo này đề xuất một phương pháp đơn giản và hiệu quả để tạo ra hấp thụ đa đỉnh, hấp thụ dải rộng sử dụng vật liệu biến hóa với cấu trúc dễ chế tạo.

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