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Related Concept Videos

Active Filters01:25

Active 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:
Passive Filters01:27

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 frequency...
Bandpass Sampling01:17

Bandpass 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...
Parallel Resonance01:23

Parallel 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:
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Related Experiment Video

Updated: Jun 5, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Highly-efficient aperture array terahertz band-pass filtering.

Dmitry S Bulgarevich1, Makoto Watanabe, Mitsuharu Shiwa

  • 1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. DMITRY.Bulgarevich@nims.go.jp

Optics Express
|December 18, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a novel microfabricated aluminum aperture array designed for high optical transmission. The device achieves over 100% transmission efficiency at a specific frequency, independent of polarization.

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Area of Science:

  • Optics
  • Materials Science
  • Nanotechnology

Background:

  • Optical transmission efficiency is crucial for various photonic applications.
  • Designing microaperture arrays requires precise control over geometry and material properties.

Purpose of the Study:

  • To design and fabricate a microfabricated aperture array for enhanced optical transmission.
  • To investigate the transmission characteristics of the designed array at a desired frequency.

Main Methods:

  • Microfabrication of pointed-shape apertures in thin-film aluminum on a silicon substrate.
  • Characterization of optical transmission efficiency and polarization dependence.

Main Results:

  • Achieved over 100% optical transmission relative to the substrate at a narrow band-pass resonance.
  • Demonstrated polarization-independent transmission strength and band-pass shape across filter rotation angles.

Conclusions:

  • The microfabricated aluminum aperture array effectively maximizes transmission efficiency at the target frequency.
  • The design exhibits robust performance, unaffected by polarization or filter orientation.