In this paper, we propose a tunable dual-band metamaterial absorber with wide-angle characteristics. The absorber is composed of a cross-shaped graphene layer and a layer of gold separated by a dielectric spacer. The simulated results show that there are two near-perfect absorption peaks in infrared band. Also, the peak wavelengths of absorber can be adjusted by changing the Fermi energy of the graphene and geometric parameters. In addition, the absorber can maintain a high absorption at a wide range of incident angles for both TE and TM waves. Such a device could be used as tunable sensors, filters, detector or other graphene-based photonic devices.
In this paper, a composite grating with nanogaps was designed to realize local field enhancement. The composite grating consists of a short and a long rod each period, which is seperated by a nanogap with two alternating metal width. And a small rectangle is dug in the middle of long rods. The simulation result shows that the local field can be greatly enhanced. This is because that the plasmonics resonance couple between each metal section occurs. And this nanostructure can be used in improving local field enhancement.
In this paper, we theoretically design a nanostructure combined bowtie nanoantenna with V-structured hole, which offers a way to increase the ability of the nanostructure to enhance the optical near field. This nanostructure is designed to both limit the incident light in the nanoscale and produce large near-field enhancement. In addition, we study the effect of the geometric parameters of the bowtie nanoantenna with V-structured hole on the enhancement. Such structure will be beneficial to the focusing and collimating capabilities of integrated lens antennas.
Plasmonic-induced transparency (PIT) in the metal-insulator-metal plasmonic waveguide with two side-coupled rectangular ring disk structures is numerically investigated. The PIT resonance occurs as a consequence of the destructive interference between the two structures. It is found that the transmittance can be easily adjusted by changing the parameters of the structure and coupling distance between the structure and waveguide. By optimizing the parameters, the transmittance of the structure can up to 75% in our discussion. These results may have important applications for designing integrated devices such as narrow-frequency optical filters, novel sensors and high-speed switches.
A new optical sensor based on the surface plasmon resonance (SPR) is proposed and characterized. The sensor is composed by sandwiching the graphene sheets between two metal films in the Kretschmann configuration. The resonance angle and the sensitivity of proposed sensor are analyzed through the transfer matrix method. Moreover, the refractive index change of the analyte can be detected accurately by using the proposed sensor. It is observed that the sensitivity of the proposed bimetallic sensor configuration can be greatly enhanced than conventional single metal configuration by optimizing the thickness of the metals and the number of graphene layers. Finally, we believe that the proposed SPR configuration can further promote the biosensing application.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.