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Đèn LED nano truyền dữ liệu hiệu quả hơn 2000 lần so với laser

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Posted by  in: Công nghệ

Những nhà nghiên cứu tại đại học Standford đã tạo ra một sự đột phá trong việc phát triển các chip truyền dữ liệu quang học. Hệ thống truyền tin quang học bằng laser đã xuất hiện và có hiệu suất tốt, nhưng những bóng đèn LED mới của công trình nghiên cứu này có thể tăng hiệu quả năng lượng lơn hơn 2000 lần so với laser.

Với mỗi bit được truyền được, công nghệ LED mới chỉ tiêu hao mức năng lượng là 0.25 fJ (femto-joules) trong khi ánh sáng laser cần đến 500 fJ để truyền thành công 1bit thông tin. Những con chip sử dụng LED trong tương lai có thể đạt tốc độ truy xuất lên đến 10Gbps.

Đèn LED bình thường phát ánh sáng ở một số tần số nào đó, trong khi đèn LED do đại học Standford nghiên cứu chỉ phát ở một tần số duy nhất. Điện được đưa vào các điểm indium arsenide (InAs, một loại vật liệu bán dẫn) để cho phép ánh sáng truyền qua. Sau đó, những tia sáng này được hội tụ bằng một tinh thể quang tử (một dạng cấu trúc nano quang học, được tạo ra bằng cách tạo nhiều lỗ trên vật liệu bán dẫn) để "ép" ánh sáng phát xạ ở một tần số xác định. Công nghệ mới này được thiết kế cho các thế hệ chip máy tính tiếp theo với việc sử dụng các công nghệ quang học nhằm giảm giá thành sản phẩm. Trong tương lai, chúng ta sẽ có những chiếc 
máy tính nhanh hơn và tiêu thụ ít điện năng hơn các thiết bị điện toán hiện tại.

Last modified on Wednesday, 28 December 2011 04:24
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