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Spoof localized surface plasmons on ultrathin textured MIM ring resonator with enhanced resonances.

Zhou YJ, Xiao QX, Yang BJ - Sci Rep (2015)

Bottom Line: Quality factors of resonance peaks have become much larger and multipolar resonances modes can be easily observed on the textured MIM ring resonator excited by a microstrip line.We have shown that the fabricated resonator is sensitive to the variation of both the dielectric constant and the thickness of surrounding materials under test.The spoof plasmonic resonator can be used as key elements to provide many important device functionalities such as optical communications, signal processing, and spectral engineering in the plasmonic integration platform.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China.

ABSTRACT
We numerically demonstrate that spoof localized surface plasmons (LSPs) resonant modes can be enhanced based on ultrathin corrugated metal-insulator-metal (MIM) ring resonator. Further enhancement of the LSPs modes has been achieved by incorporating an efficient and ease-of-integration exciting method. Quality factors of resonance peaks have become much larger and multipolar resonances modes can be easily observed on the textured MIM ring resonator excited by a microstrip line. Experimental results validate the high-efficiency excitation and resonance enhancements of spoof LSPs modes on the MIM ring resonator in the microwave frequencies. We have shown that the fabricated resonator is sensitive to the variation of both the dielectric constant and the thickness of surrounding materials under test. The spoof plasmonic resonator can be used as key elements to provide many important device functionalities such as optical communications, signal processing, and spectral engineering in the plasmonic integration platform.

No MeSH data available.


(a) Dispersion curves of spoof SPPs on the corrugated MIM strips when the width g of the insulator (air) changes, where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for one unit cell. (b) Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths. (c) Dispersion curves of spoof SPPs for the corrugated MIM strips when the thickness t of the substrate changes. (d) S11 spectra of corrugated MIM resonator with different thickness t of the substrate.
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f6: (a) Dispersion curves of spoof SPPs on the corrugated MIM strips when the width g of the insulator (air) changes, where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for one unit cell. (b) Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths. (c) Dispersion curves of spoof SPPs for the corrugated MIM strips when the thickness t of the substrate changes. (d) S11 spectra of corrugated MIM resonator with different thickness t of the substrate.

Mentions: When the thickness t of the substrate and the width g of the insulator (air) changes, the dispersion relations of corresponding spoof SPPs on the corrugated MIM strips are plotted in Fig. 6(a), where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for the unit cell in simulation. When the width g of insulator (air) is changed from 1.5 mm to 0.5 mm, corresponding asymptotic frequencies of dispersion curves in Fig. 6(a) are pulled down. Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths are shown in Fig. 6(b). It can be seen that all resonance nadirs below asymptotic frequencies red shift when g decreases. According to the above standing wave analysis in Fig. 4(d), for a specific resonant mode Mi, the spoof LSPs wavelength λgMi and wave vector β are fixed. From the dispersion curves in Fig. 6(a), for the same plasmonic wavevector β, the frequency becomes smaller. Hence, the red shifts of spoof LSPs resonant frequencies are consistent with the dispersion relations. When the thickness t of substrate is gradually increased from 0.254 mm to 1.016 mm, corresponding asymptotic frequencies of dispersion curves shown in Fig. 6(c) are pulled down. Red shift of resonance nadirs below asymptotic frequencies can also be observed from S11 spectra with different thickness t, which are plotted in Fig. 6(d). From Fig. 6(b,d), we can see that nearly all the resonance modes are the strongest when g = 1 mm or t = 0.508 mm. Hence the optimized parameters are chosen as g = 1 mm and t = 0.508 mm.


Spoof localized surface plasmons on ultrathin textured MIM ring resonator with enhanced resonances.

Zhou YJ, Xiao QX, Yang BJ - Sci Rep (2015)

(a) Dispersion curves of spoof SPPs on the corrugated MIM strips when the width g of the insulator (air) changes, where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for one unit cell. (b) Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths. (c) Dispersion curves of spoof SPPs for the corrugated MIM strips when the thickness t of the substrate changes. (d) S11 spectra of corrugated MIM resonator with different thickness t of the substrate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588594&req=5

f6: (a) Dispersion curves of spoof SPPs on the corrugated MIM strips when the width g of the insulator (air) changes, where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for one unit cell. (b) Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths. (c) Dispersion curves of spoof SPPs for the corrugated MIM strips when the thickness t of the substrate changes. (d) S11 spectra of corrugated MIM resonator with different thickness t of the substrate.
Mentions: When the thickness t of the substrate and the width g of the insulator (air) changes, the dispersion relations of corresponding spoof SPPs on the corrugated MIM strips are plotted in Fig. 6(a), where p = 0.94 mm, a = 0.376 mm, h = 3 mm, and s = 2 mm for the unit cell in simulation. When the width g of insulator (air) is changed from 1.5 mm to 0.5 mm, corresponding asymptotic frequencies of dispersion curves in Fig. 6(a) are pulled down. Reflection coefficients (S11) spectra of corrugated MIM resonator with different insulator widths are shown in Fig. 6(b). It can be seen that all resonance nadirs below asymptotic frequencies red shift when g decreases. According to the above standing wave analysis in Fig. 4(d), for a specific resonant mode Mi, the spoof LSPs wavelength λgMi and wave vector β are fixed. From the dispersion curves in Fig. 6(a), for the same plasmonic wavevector β, the frequency becomes smaller. Hence, the red shifts of spoof LSPs resonant frequencies are consistent with the dispersion relations. When the thickness t of substrate is gradually increased from 0.254 mm to 1.016 mm, corresponding asymptotic frequencies of dispersion curves shown in Fig. 6(c) are pulled down. Red shift of resonance nadirs below asymptotic frequencies can also be observed from S11 spectra with different thickness t, which are plotted in Fig. 6(d). From Fig. 6(b,d), we can see that nearly all the resonance modes are the strongest when g = 1 mm or t = 0.508 mm. Hence the optimized parameters are chosen as g = 1 mm and t = 0.508 mm.

Bottom Line: Quality factors of resonance peaks have become much larger and multipolar resonances modes can be easily observed on the textured MIM ring resonator excited by a microstrip line.We have shown that the fabricated resonator is sensitive to the variation of both the dielectric constant and the thickness of surrounding materials under test.The spoof plasmonic resonator can be used as key elements to provide many important device functionalities such as optical communications, signal processing, and spectral engineering in the plasmonic integration platform.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China.

ABSTRACT
We numerically demonstrate that spoof localized surface plasmons (LSPs) resonant modes can be enhanced based on ultrathin corrugated metal-insulator-metal (MIM) ring resonator. Further enhancement of the LSPs modes has been achieved by incorporating an efficient and ease-of-integration exciting method. Quality factors of resonance peaks have become much larger and multipolar resonances modes can be easily observed on the textured MIM ring resonator excited by a microstrip line. Experimental results validate the high-efficiency excitation and resonance enhancements of spoof LSPs modes on the MIM ring resonator in the microwave frequencies. We have shown that the fabricated resonator is sensitive to the variation of both the dielectric constant and the thickness of surrounding materials under test. The spoof plasmonic resonator can be used as key elements to provide many important device functionalities such as optical communications, signal processing, and spectral engineering in the plasmonic integration platform.

No MeSH data available.