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光学整流天线 把光直接变成直流电
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An optical rectenna—a device that directly converts free-propagating electromagnetic waves at optical frequencies to direct current—was first proposed over 40 years ago1, yet this concept has not been demonstrated experimentally due to fabrication challenges at the nanoscale2,3. Realizing an optical rectenna requires that an antenna be coupled to a diode that operates on the order of 1 PHz (switching speed on the order of 1 fs). Diodes operating at these frequencies are feasible if their capacitance is on the order of a few attofarads3,4, but they remain extremely difficult to fabricate and to reliably couple to a nanoscale antenna2. Here we demonstrate an optical rectenna by engineering metal–insulator–metal tunnel diodes, with a junction capacitance of ∼2 aF, at the tip of vertically aligned multiwalled carbon nanotubes (∼10 nm in diameter), which act as the antenna5,6. Upon irradiation with visible and infrared light, we measure a d.c. open-circuit voltage and a short-circuit current that appear to be due to a rectification process (we account for a very small but quantifiable contribution from thermal effects). In contrast to recent reports of photodetection based on hot electron decay in a plasmonic nanoscale antenna7,8, a coherent optical antenna field appears to be rectified directly in our devices, consistent with rectenna theory4,9,10. Finally, power rectification is observed under simulated solar illumination, and there is no detectable change in diode performance after numerous current–voltage scans between 5 and 77 °C, indicating a potential for robust operation. |
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- 附件 2 : Infrared_rectification_in_a_nanoantenna-coupled_metal-oxide-semiconductor_tunnel_diode.pdf
2015-11-14 05:09:09, 3.61 M
2015-11-14 05:09:28, 4.07 M
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- 光学整流天线 把光直接变成直流电
已经有1人回复
4楼2015-11-17 13:03:55
简单回复
年初一2楼
2015-11-16 00:04
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五星好评 顶一下，感谢分享！
2015-11-16 09:19
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五星好评 顶一下，感谢分享！
kings015楼
2017-10-03 19:43
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五星好评 顶一下，感谢分享！
kings016楼
2018-07-03 16:16
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顶一下，感谢分享！