کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1493679 | 1510787 | 2015 | 5 صفحه PDF | دانلود رایگان |
• A broad pass-band can be achieved over 96% transmittance across the 90.0–105.0 THz.
• The well-matched impedance to free space across leads to the ass-band.
• A nearly constant effective impedance was observed with a small variation of 3.8%.
• The fabricated metamaterial filter can be modulated from a double negative material to a normal material throughout the pass-band.
• The pass-band is expanded with w2 increasing or h1 reducing.
We present the simulation, and fabrication of an optical metamaterial filter. It consists of two silver layers and one SU-8 layer perforated with periodic sub-wavelength holes arrays which are prepared by optical lithography. Measured results indicate that a broad pass-band with over 96% transmittance across 90.0–105.0 THz frequency range can be obtained. Effective permeability, permittivity, and impedance are retrieved by applying S parameter retrieval method. These retrieved effective parameters show that the fabricated metamaterial filter can be modulated from a double negative material to a normal material in pass-band. Real parts of effective permeability and permittivity follow a similar slope results in well-matched impedance to free space, which leads to the broad pass-band. Furthermore, effects of nano-hole sidewall length (w2) and thickness of dielectric layer (h1) are experimental surveyed. The pass-band is expanded with w2 increasing or h1 reducing due to the reduced of strength of electromagnetic resonance.
Journal: Optical Materials - Volume 47, September 2015, Pages 62–66