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Sci Rep. 2016 Dec 19;6:39106. doi: 10.1038/srep39106.

Polarization-independent split bull's eye antennas for infrared nano-photodetectors.

Yang M1,2, Ren FF1,2, Pu L1,2, Xiao L1,2, Sheng Y1,2, Wang J1,2, Lu H1,2, Zheng Y1,2, Shi Y1,2.

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Key Laboratory of Advanced Photonic and Electronic Materials and School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.


Split bull's eye (SBE) antennas exhibit much larger extraordinary optical transmission and strong polarization dependence rather than bull's eye (BE) antennas in the infrared range due to the introduced sub-wavelength slit. Here, we demonstrate a dual-split bull's eye (DSBE) antenna, which consists of two sub-wavelength slits crossing through the center of the BE antenna with an intersection angle θ. The polarization dependence in transmission can be flexibly tailored by adjusting the intersection angle, following a cos2 (Φ + θ/2) angular dependence on polarization angle Φ. When θ = 90°, the DSBE antenna yields high and polarization-independent transmission enhancement over the entire infrared spectrum. It presents highly promising applications for polarization-insensitive photodetectors and other optoelectronic devices.

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