Anticrossing of plasmon resonances and giant enhancement of interlayer terahertz electric field in an asymmetric bilayer of two-dimensional electron strips

We carry out a theoretical analysis of the terahertz response of an asymmetric bilayer of two-dimensional electron strips, modeling the double-quantum-well electron channel of a grid-gated field-effect transistor in which strong terahertz photoresponse was recently observed. We have shown that mixing between optical and acoustic plasmons hugely increases at the anticrossing of optical-like and acousticlike plasma resonances excited by incoming terahertz radiation in such a bilayer. As a result, the amplitude of the interlayer terahertz electric field also increases dramatically in the anticrossing regime, becoming two and a half orders of magnitude greater than the amplitude of electric field of incoming terahertz wave.

[1]  John L. Reno,et al.  Terahertz photoconductivity and plasmon modes in double-quantum-well field-effect transistors , 2002 .

[2]  O. R. Matov,et al.  Spectrum of plasma oscillations in structures with a periodically inhomogeneous two-dimensional electron plasma , 1998 .

[3]  Granino A. Korn,et al.  Mathematical handbook for scientists and engineers , 1961 .

[4]  Michael C. Wanke,et al.  Absorption of terahertz radiation by plasmon modes in a grid-gated double-quantum-well field-effect transistor , 2003 .

[5]  Michael C. Wanke,et al.  Plasmon-induced terahertz absorption and photoconductivity in a grid-gated double-quantum-well structure , 2004 .

[6]  Grambow,et al.  One-dimensional plasmons in AlGaAs/GaAs quantum wires. , 1991, Physical review letters.

[7]  S. Katayama,et al.  Far-Infrared Transmission Spectra of Laterally Confined 2D Plasma in Quantum Wires , 1991 .

[8]  S. J. Allen,et al.  Tunable terahertz detection based on a grating-gated double-quantum-well FET , 2004 .

[9]  Heitmann,et al.  Optical and acoustic plasmons in two-layered quantum wires. , 1992, Physical Review B (Condensed Matter).

[10]  Li,et al.  Elementary excitation spectrum of one-dimensional electron systems in confined semiconductor structures: Finite magnetic field. , 1991, Physical review. B, Condensed matter.

[11]  Vidar Gudmundsson,et al.  Far-infrared absorption of acoustic and optical magnetoplasmons in double-layered quantum wires , 1997 .

[12]  Hansen,et al.  Nonparabolic confinement in quantum wire superlattices. , 1992, Physical Review B (Condensed Matter).

[13]  Grambow,et al.  Far-infrared response of one-dimensional electronic systems in single- and two-layered quantum wires. , 1988, Physical review. B, Condensed matter.

[14]  E. Linfield,et al.  ANGLE-RESOLVED RAMAN SPECTROSCOPY OF THE COLLECTIVE MODES IN AN ELECTRON BILAVER , 1999 .