Abstract
The phenomenon of extraordinary optical transmission (EOT) due to its advantages has been considered by researchers in various applications, and in recent years, many efforts have been made to engineer these structures to get the best possible response for desired applications. In this work, the optical properties of novel binary gold nanohole arrays are investigated theoretically. We engineered the optical response of the system by adjusting the ratio of contribution of surface plasmon polariton (SPP) to localized surface plasmon resonance (LSPR) through the manipulation of the geometrical properties. The changes in the topology of this nanohole array affected the intensity and the wavelength of transmission peaks. The sensitivity of the optical response to the refractive index was also investigated. The designed structure is a good candidate for use as a polarization-independent optical label-free sensor.
Highlights
Since the discovery of Extraordinary optical transmission (EOT) by the group of Ebbesen in 1998[1], this phenomena has attracted the attention of many researchers due to its widespread applications in sensing[2,3,4], color filters[5, 6], perfect absorbers[7, 8], metamaterials[9], lenses[10], etc
localized surface plasmon resonance (LSPR) and surface plasmon polaritons (SPP) can co-exist at specific wavelengths such that the coupling between them can contribute to the optimization of the nanohole arrays to get the desired optical response for different applications[14]
Here, we investigate the evolution of plasmonic properties of binary nanohole array using transmittance spectra
Summary
Since the discovery of Extraordinary optical transmission (EOT) by the group of Ebbesen in 1998[1], this phenomena has attracted the attention of many researchers due to its widespread applications in sensing[2,3,4], color filters[5, 6], perfect absorbers[7, 8], metamaterials[9], lenses[10], etc. If the dimensions of the thin metal film are further reduced to smaller than the incident wavelength, the retardant effects will be negligible and the electrons throughout the metal oscillate in phase This phenomenon is known as localized surface plasmon resonance (LSPR) and is usually excited in curved metal objects such as metal nanoparticles and cavities of various topologies, providing the topology of additional momentum to couple directly to incident light[13]. We designed and numerically simulated a novel binary nanohole array for extraordinary optical transmission applications. The periodic boundary conditions have been applied in x and y-directions in a unit cell of the nanohole array This lets us obtain the optical response of the entire system in a much shorter time scale. In the z-direction of the incident plane wave propagation, perfectly matched layers (PML) were utilized
Sign-in/Register to view highlights & summary 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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
