Vandermeiren, W., Stiens, J., Shkerdin, G., De Tandt, C., & Vounckx, R. (2014). Normal incidence infrared modulator based on single quantum well intersubband transitions. Journal of Physics D: Applied Physics, 47.

@article{7061f4d6706c4c0896b79af2e7d3cd72,
title = "Normal incidence infrared modulator based on single quantum well intersubband transitions",
abstract = "An infrared modulator of which the working principle is based on evanescent wave generation and intersubband transitions in a single AlGaAs/GaAs quantum well is presented here. CO2 laser light at normal incidence is coupled to an evanescent wave by means of a sub-wavelength diffraction grating. Modulation of the zeroth order re?ective mode is achieved by applying an electric ?eld across the quantum well. The model for deriving the complex refractive index of the quantum well region is presented and used for numerical diffraction ef?ciency simulations as a function of the groove height and period. Two specimens with different groove heights were fabricated. Experiments are conducted at a wavelength of 10.6µm. At this wavelength a relatively strong absolute modulation depth of about 20% could be observed. The experimental results are in good agreement with our model and diffraction efficiency calculations.",
keywords = "IR modulator, quantum well, evanescent waves, Q-switching",
author = "Werner Vandermeiren and Johan Stiens and Gennady Shkerdin and {De Tandt}, Cathleen and Roger Vounckx",
year = "2014",
language = "English",
volume = "47",
journal = "Journal of Physics D: Applied Physics",
issn = "0022-3727",
publisher = "IOP Publishing Ltd.",
}