Efficient band-pass and stop-band filtering by GaAs–Al_cGa_1−cAs generalized Thue–Morse multibarrier systems

Abstract

The influence of Al concentration and barrier width on the transmission spectra in GaAs–Al _c Ga_{1− c} As heterostructure is studied for two different kinds of the generalized Thue–Morse multibarrier systems (GTMS). These structures provide interesting filter properties with regard to effective band-pass or stop-band (of extremely low width) circuitry. The first kind of GTMS is suitable for application as a band-pass electronic filter, while the second kind as stop-band filter. High Al concentration and large barrier width result in sharp resonances in the transmission spectrum.

Keywords:

• resonant tunneling
• electronic filter
• band-pass and stop-band filtering
• quasiperiodic multibarrier systems
• Thue–Morse sequence

PACS:

• 73.40.Gk – Tunneling
• 84.30.Vn – Electronic Filter
• 78.67.Pt – Multilayers
• superlattices

Acknowledgement

The author gratefully acknowledges Prof. P. K. Mahapatra, Dr. A. Khan and Dr. R. Biswas for their valuable suggestions.