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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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Updated: Aug 25, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Narrow-band transmission filter based on 1D-PCs with a defect layer.

Reza Jafari, Mostafa Sahrai, Forough Bozorgzadeh

|October 18, 2022

Summary

This study demonstrates a novel narrow-band transmission filter using silicon dioxide/titanium dioxide (TiO2) photonic crystals. The filter

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Last Updated: Aug 25, 2025

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Published on: February 25, 2017

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

One-dimensional photonic crystals offer tunable optical properties.
Sol-gel spin-coating is a versatile method for fabricating thin-film devices.
Tailoring layer thickness is crucial for controlling optical filter performance.

Purpose of the Study:

To develop a narrow-band transmission filter using SiO2/TiO2 one-dimensional photonic crystals.
To investigate the effect of defect layers on filter characteristics.
To optimize filter performance by controlling layer thickness and defect material.

Main Methods:

Fabrication of SiO2/TiO2 photonic crystal filters using sol-gel spin-coating.
Characterization of structural and optical properties using atomic force microscopy, scanning electron microscopy, and UV-visible spectroscopy.
Engineering of layer thickness and defect layer material to tune transmission and bandgap.

Main Results:

Achieved narrow-band transmission filters with tunable characteristics.
Demonstrated maximum transmission of 58.09% for TiO2 defect layers and 42.21% for InP defect layers.
Showcased layer thickness control via spin-coater rotational speed.

Conclusions:

Sol-gel spin-coating is effective for fabricating tunable photonic crystal filters.
Defect layer engineering significantly impacts optical filter performance.
The developed filters show potential for various optical applications.