Abstract
Planar hybrid metamaterial with different split ring resonators (SRR) structure dimensions are fabricated on silicon substrates by femtosecond (fs) laser micro-lens array (MLA) lithography and lift-off process. The fabricated metamaterial structures consist of: (a) uniform metamaterial with 4 SRRs at same design and dimension as a unit cell and (b) hybrid metamaterial with 4 SRRs at same design but different dimensions as a unit cell. The electromagnetic field responses of these hybrid and single dimension metamaterial structures are characterized using a terahertz (THz) time-domain spectroscopy. Transmission spectra of these metamaterial show that a broader resonance peak is formed when 2 SRRs are close to each other. FDTD simulation proves that there is a strong mutual coupling between 2 SRRs besides a strong localized electric field at the split gap, which can enhance the electric field up to 364 times for tunable, broad band and high sensitivity THz sensing. Meanwhile, the strong coupling effect could lead to the formation of an additional resonance peak at approximately 0.2 THz in the THz spectra regime.
Highlights
Metamaterial are artificially engineered structures that exhibit extraordinary electromagnetic response which cannot be found in naturally available materials
In order to control the distance between sample and micro-lens array (MLA), the laser was coupled with a precision XY translation nanopositioning stage with computer numerical control (CNC)
split ring resonator (SRR) metamaterial consist of an array of unit cells in which all unit cells comprise of identical SRRs
Summary
Metamaterial are artificially engineered structures that exhibit extraordinary electromagnetic response which cannot be found in naturally available materials. SRR metamaterial are arrays of sub-wavelength scale (typically in the order of ~λ/10) structures formed in periodical arrangement These structures are used to manipulate the electromagnetic field in a controllable manner. Research showed that the architectural SRR elements of metamaterial give one the ability to control different electromagnetic wave’s electric and/or magnetic resonant response by changing the SRR designs. These phenomena of resonance tuning were demonstrated at different wavelengths, including radiowave, microwave, IR-range as well as visible light [5,6,7,8,9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
