A Multipurpose and Highly-Compact Plasmonic Filter Based on Metal-Insulator-Metal Waveguides

Abstract

A multipurpose and ultra-compact nanoplasmonic wavelength filter based on stub structure in a metal-insulator-metal (MIM) waveguide is suggested and numerically investigated. A novel approach of connecting two stepped-like apertures to both input and output ports is applied to form Fabry-Perot (FP) cavities, which enabled the structure to act as a dual band-pass filter at wavelengths 1310 nm and 1550 nm. It is shown that the variation in cavities' length allows to realize a long-wavelength cutoff filter, and cutoff wavelength can be easily tuned by adjusting the length of the cavities. Furthermore, it is revealed that increasing the gap between the stepped-like apertures and the cavities provides a triple band-pass at telecom wavelengths, e.g., 1267.5 nm, 1414.19 nm, and 1644.7 nm. The tunable broadband high-pass wavelength filter is then achieved while the lengths of stepped-like apertures and stub resonators are set to be identical. Finally, a tunable nearly perfect absorber can be obtained by varying the width of stub resonators. Therefore, because of functionality, size, as well as efficiency the proposed plasmonic filter may greatly contribute to miniaturization of next generation of photonic integrated circuits (PICs), and find applications in on-chip integration and wavelength-division multiplexing (WDM) in optical communication systems.

A Reconfigurable and Ultra-Compact Plasmonic Filter based on MIM Waveguides at Optical Channels

“…In conclusion, we have proposed a highly-compact yet efficient multifunctional plasmonic wavelength filter that operates at technologically important telecom wavelengths. The suggested plasmonic device is considerably more compact and efficient compared with recently proposed plasmonic structures [5,7]. We thus hope that the suggested plasmonic device may pave the way for realization of fast, highly-efficient and miniaturized devices for on-chip applications and in point-of-care (POC) and medical diagnostic instruments.…”

“…On the other hand, size, efficiency, and potentially, the ability to provide several functions in a single structure are of great interest in the evolution of next generation of PICs. Thus, based on our previous studies [4,5], we have proposed a reconfigurable and highly compact and efficient wavelength filter based on MIM waveguides, operating at technologically important telecom wavelengths. Numerical results reveal that by tuning the geometrical parameters, the proposed device can operate as a flat-top bandpass filter, a dualband bandpass filter, as well as a short-wavelength cut-off filter, while maintaining a high level of efficiency.…”

A Highly-Efficient and Compact Surface Plasmon Polaritons-based Long-Wavelength Cut-off Filter at Telecom Wavelengths

“…In conclusion, we have proposed a miniaturized and highly-efficient long-wavelength cut-off filter that operates at technologically important telecom wavelengths. The suggested plasmonic device is more efficient and compact compared with previous research studies [8,9], and may find applications in PICs and on-chip optical circuits.…”

A Highly-Efficient and Compact Surface Plasmon Polaritons High-Pass Filter based on MIM waveguides

“…In conclusion, we have designed and simulated an-ultra compact and highly-efficient high-pass wavelength filter based on MIM waveguide that works at the near-infrared (NIR) range. The suggested filter is considerably more compact and efficient in comparison with previous research studies [9,10], and may find applications in photonic integrated circuits (PICs) and in on-chip optical circuits.…”