Reduction of Interference Oscillations in Observing Intersubband Transitions in AlSb/GaSb Superlattices by Fourier Transform Infrared Spectroscopy

Chin. Phys. Lett.

1995, Vol. 12

Issue (11): 685-688 DOI:

Original Articles

Reduction of Interference Oscillations in Observing Intersubband Transitions in AlSb/GaSb Superlattices by Fourier Transform Infrared Spectroscopy

RU Guoping;LI Aizhen

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050

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RU Guoping, LI Aizhen 1995 Chin. Phys. Lett. 12 685-688

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Abstract Intersubband transitions from L₁ to L₂ subbands in AISb/GaSb superlattices in the 8-18 μm wavelength range are observed by employing normal- and oblique-incident Fourier transform infrared (FTIR) spectroscopic techniques. Using AlSb rather than GaSb as the buffer layer, interference oscillations in normal-incident FTlR spectra are significantly reduced, which facilitates one to distinguish intersubband transition features. In the oblique-incident mode where a 45° thallium hexahedron is used for internal reflection, interference oscillations are eliminated, making it possible to observe weak intersubband transitions that cannot be distinguished in normal-incident absorption spectra.

Keywords: 78.30.Fs 78.66.Fd 73.20.Dx

Published: 01 November 1995

PACS:	78.30.Fs	(III-V and II-VI semiconductors)
	78.66.Fd	(III-V semiconductors)
	73.20.Dx

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1995/V12/I11/0685

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