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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are 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...
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...

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Related Experiment Video

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Continuous wave terahertz systems exploiting 1.5 microm telecom technologies.

B Sartorius1, M Schlak, D Stanze

  • 1Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Einsteinufer 37, 10587 Berlin, Germany. bernd.sartorius@hhi.fraunhofer.de

Optics Express
|August 19, 2009
PubMed
Summary
This summary is machine-generated.

A novel fiber-assembled continuous-wave terahertz (THz) system uses telecom photodiodes for THz emission and photoconductive antennas for detection, enabling broadband operation.

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Area of Science:

  • Optoelectronics
  • Terahertz (THz) Technology
  • Photonics

Background:

  • Continuous-wave (CW) THz systems are crucial for various applications.
  • Existing systems often face limitations in terms of integration and frequency range.
  • Fiber-optic integration offers potential for compact and versatile THz sources and detectors.

Purpose of the Study:

  • To present a novel fiber-assembled CW THz system.
  • To demonstrate THz generation and detection using integrated photonic and electronic components.
  • To evaluate the system's performance over a broad frequency spectrum.

Main Methods:

  • Utilizing high-speed telecom photodiodes integrated with planar THz antennas as THz emitters.
  • Employing photoconductive antennas based on LT InGaAs/InAlAs multi-layer structures for coherent THz detection.
  • Assembling the system using fiber-optic components for seamless integration.

Main Results:

  • Achieved THz emission power up to 10 microwatts.
  • Demonstrated coherent detection capability using advanced photoconductive antennas.
  • Operated the system across a wide frequency range from 0.1 to 1.6 THz.

Conclusions:

  • The developed fiber-assembled CW THz system offers a compact and versatile solution.
  • The integration of telecom photodiodes and specialized antennas enables efficient THz generation and detection.
  • The system's broad frequency range makes it suitable for diverse THz spectroscopic and imaging applications.