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Passive Filters

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...

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Ultra-efficient diamond plasmonic band-stop filter with enhanced effect.

Zuoxin Zhang, Hengli Feng, Dongchao Fang

|October 18, 2022

Summary

This study presents a novel surface plasmon polariton band-stop filter. Enhanced transmittance and high sensitivity were achieved using double-diamond and double-rectangular resonators for optical applications.

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Area of Science:

Photonics and Plasmonics
Optical Filter Design
Nanophotonics

Background:

Surface plasmon polariton (SPP) based devices offer unique light manipulation capabilities.
Metal-insulator-metal (MIM) structures are key components in plasmonic devices.
Band-stop filters are crucial for wavelength selection in optical systems.

Purpose of the Study:

To design and investigate a novel band-stop filter utilizing SPP in an MIM structure.
To enhance filter performance through the use of double-resonator designs.
To evaluate the sensitivity of the designed filter for potential sensing applications.

Main Methods:

Finite difference time domain (FDTD) method for electromagnetic simulation.
Coupled mode theory (CMT) for analyzing resonator behavior.
Design and simulation of single-diamond, double-diamond, and double-rectangular resonators.

Main Results:

The double-diamond resonator exhibited an 11.33% increase in minimum transmittance compared to a single-diamond resonator.
The double-rectangular resonator showed a 14.25% increase in minimum transmittance.
The designed filter demonstrated a high sensitivity of 860 nm/RIU (Refractive Index Unit).

Conclusions:

The proposed SPP band-stop filter with double-resonator structures significantly enhances transmittance.
The high sensitivity indicates potential for refractive index sensing applications.
The filter shows promise for integration into optical communication and information processing systems.