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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Related Experiment Video

Updated: Jul 7, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Linear electro-optic effect in the organic crystal 4-aminobenzophenone.

S Lochran1, R T Bailey, F R Cruickshank

  • 1Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, United Kingdom.

Applied Optics
|January 20, 1997
PubMed
Summary

The linear electro-optic effect was studied in 4-aminobenzphenone (ABP) crystals. This research provides key electro-optic coefficients and half-wave voltage data for ABP and lithium niobate (LiNbO3).

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Published on: October 18, 2018

Area of Science:

  • Materials Science
  • Optoelectronics
  • Nonlinear Optics

Background:

  • The linear electro-optic effect is crucial for optical modulation technologies.
  • Accurate characterization of electro-optic materials is essential for device development.
  • Lithium niobate (LiNbO3) is a benchmark material, but novel alternatives are sought.

Purpose of the Study:

  • To investigate and report the linear electro-optic effect in 4-aminobenzphenone (ABP) single crystals.
  • To determine the electro-optic coefficients (r22, r32) and reduced half-wave voltages for ABP.
  • To provide calibration data using LiNbO3 for comparison.

Main Methods:

  • Experimental measurement of the linear electro-optic effect.
  • Utilizing optical interferometry techniques.
  • Employing standard calibration procedures with LiNbO3 crystals.

Main Results:

  • The linear electro-optic coefficients for ABP at 488 nm were determined as r(22) = 2.12 pm/V and r(32) = 5.05 pm/V.
  • The corresponding reduced half-wave voltages for ABP were 49.4 ± 0.1 kV and 9.3 ± 0.1 kV.
  • Calibration data for LiNbO3 showed half-wave voltages of 4.0 ± 0.1 kV (632.8 nm) and 2.4 ± 0.1 kV (488 nm).

Conclusions:

  • 4-aminobenzphenone exhibits significant linear electro-optic properties.
  • The determined coefficients and voltages offer valuable data for potential optoelectronic applications.
  • The study establishes ABP as a material of interest for electro-optic device research.