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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...

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Related Experiment Video

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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
07:56

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

Published on: September 20, 2017

Wavelength tunable infrared light source based on semiconductor-integrated liquid crystal filter.

Yu-Hsin Yao1, Chun-Ta Wang, Rui-Ren Chen

  • 1Department of Photonics, National Sun Yat Sen University, Kaohsiung, Taiwan.

Optics Express
|October 6, 2012
PubMed
Summary
This summary is machine-generated.

This study presents an electrically tunable infrared light source using an AlGaInAs semiconductor multiple quantum well (MQW) and a liquid crystal Fabry-Pérot filter. This novel integration offers a wide tuning range for potential optical communication applications.

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Area of Science:

  • Optoelectronics
  • Materials Science

Background:

  • Broadband light emission is crucial for tunable light sources.
  • Liquid crystals offer tunable optical properties under electric fields.

Purpose of the Study:

  • To develop an electrically tunable infrared light source.
  • To integrate AlGaInAs multiple quantum wells (MQW) with liquid crystal (LC) Fabry-Pérot filters.

Main Methods:

  • Fabrication of a compact structure combining AlGaInAs MQW with LC Fabry-Pérot filters.
  • Utilizing nematic liquid crystal (NLC) for continuous tuning.
  • Employing cholesteric liquid crystal (CLC) for polarization-independent tuning.

Main Results:

  • Achieved a 58 nm tuning range with NLC under a 14 V bias.
  • Observed a 41 nm polarization-independent tuning range with CLC.
  • Experimental results align with simulation predictions for wavelength and tunability.

Conclusions:

  • The integrated AlGaInAs MQW and LC Fabry-Pérot filter scheme demonstrates significant tunability.
  • This tunable light source shows promise for optical communication systems.