Superabsorbing, Artificial Metal Films Constructed from Semiconductor Nanoantennas

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• 作者：Soo Jin Kim ; Junghyun Park ; Majid Esfandyarpour ; Emanuele F. Pecora ; Pieter G. Kik ; Mark L. Brongersma
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：16
• 期：6
• 页码：3801-3808
• 全文大小：439K
• 年卷期：0
• ISSN：1530-6992

文摘

In 1934, Wilhelm Woltersdorff demonstrated that the absorption of light in an ultrathin, freestanding film is fundamentally limited to 50%. He concluded that reaching this limit would require a film with a real-valued sheet resistance that is exactly equal to R = η/2 ≈ 188.5Ω/□, where is the impedance of free space. This condition can be closely approximated over a wide frequency range in metals that feature a large imaginary relative permittivity ε_r″, that is, a real-valued conductivity σ = ε₀ε_r″ω. A thin, continuous sheet of semiconductor material does not facilitate such strong absorption as its complex-valued permittivity with both large real and imaginary components preclude effective impedance matching. In this work, we show how a semiconductor metafilm constructed from optically resonant semiconductor nanostructures can be created whose optical response mimics that of a metallic sheet. For this reason, the fundamental absorption limit mentioned above can also be reached with semiconductor materials, opening up new opportunities for the design of ultrathin optoelectronic and light harvesting devices.