Related Experiment Video
Updated: Aug 6, 2026
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Doubly resonant single-layer bandpass optical filters
1Department of Electrical and Computer Engineering, University of Connecticut, Storrs, Connecticut 06268-1157, USA.
Optics Letters
|June 9, 2004
Summary
This study presents a novel bandpass filter using guided-mode resonance in a single-layer periodic waveguide. The filter achieves a transmission peak and broad low-transmission band using a unique resonance pair for optical applications.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Guided-mode resonance (GMR) in periodic structures enables efficient light manipulation.
- Single-layer waveguides offer simplified fabrication for photonic devices.
- Refractive index modulation is crucial for controlling resonance phenomena.
Purpose of the Study:
- To design and demonstrate a single-layer periodic waveguide bandpass filter utilizing GMR.
- To investigate the excitation of a resonance pair for tailored spectral response.
- To achieve a specific transmission profile with a central wavelength at 1.55 micrometers.
Main Methods:
- Utilizing strong refractive-index modulation in a single-layer periodic waveguide.
- Exciting leaky waveguide modes TE0 and TE2 via different diffraction orders (second and first, respectively).
- Analyzing the spectral characteristics arising from the interaction of the resonance pair.
Main Results:
- Demonstrated excitation of a resonance pair supporting distinct spectral features.
- Observed one resonance providing a broad low-transmission band.
- Achieved a transmission peak with an asymmetrical line shape from the second resonance.
- Presented a functional bandpass filter centered at 1.55 micrometers.
Conclusions:
- The presented single-layer periodic waveguide effectively functions as a bandpass filter.
- The GMR effect, particularly the resonance pair, enables precise control over spectral transmission.
- This approach offers a promising route for developing compact and efficient optical filters.
Related Concept Videos
01:12Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
01:24Characteristics of Series Resonant Circuit
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
01:23Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
01:27Passive 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 frequency...
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 frequency...
01:25Active Filters
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
01:17Bandpass Sampling
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...