Journal
FRONTIERS OF PHYSICS
Volume 10, Issue 5, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-015-0508-7
Keywords
nano-rectenna; MIM diode; surface plasmon resonance; local field enhancement; photoelectric conversion efficiency
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Funding
- Ministry of Science and Technology of China [2015DFG62610]
- National Natural Science Foundation of China [11404074]
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We designed a sector bowtie nanoantenna integrated with a rectifier (Au-TiOx-Ti diode) for collecting infrared energy. The optical performance of the metallic bowtie nanoantenna was numerically investigated at infrared frequencies (5-30 mu m) using three-dimensional frequency-domain electromagnetic field calculation software based on the finite element method. The simulation results indicate that the resonance wavelength and local field enhancement are greatly affected by the shape and size of the bowtie nanoantenna, as well as the relative permittivity and conductivity of the dielectric layer. The output current of the rectified nano-rectenna is substantially at nanoampere magnitude with an electric field intensity of 1 V/m. Moreover, the power conversion efficiency for devices with three different substrates illustrates that a substrate with a larger refractive index yields a higher efficiency and longer infrared response wavelength. Consequently, the optimized structure can provide theoretical support for the design of novel optical rectennas and fabrication of optoelectronic devices.
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