In this work we consider lateral current pumped GaAs/AlGaAs quantum wells as sources of incoherent terahertz radiation. The lateral field heats the electrons in a two-dimensional quantum layer and increases the population of higher subbands, hence also increasing the radiation power generated in spontaneous intersubband emission processes. Digitally graded quasi-parabolic and simple square quantum wells are considered, and the advantages of both types are discussed. Calculations at lattice temperatures of 77 K and 300 K, for electric fields up to 10kV/cm, show that the optical output power of 100200W/m2 may be achieved for the 7 THz source. The main peak of the spectrum, at 7 THz, of the quasi-parabolic quantum well exceeds the black body radiation at 300 K by approximately a factor of two and by two orders of magnitude at 77 K.

1.
B. S.
Williams
,
S.
Kumar
,
Q.
Hu
, and
J. L.
Reno
,
Opt. Express
13
,
3331
(
2005
).
2.
M.
Lundstrom
,
Fundamentals of Carrier Transport
(
Cambridge University Press
,
Cambridge, MA
2000
).
3.
W.
Xu
,
S. M.
Stewart
,
D. J.
Fisher
, and
C.
Zhang
,
Superlattices Microstruct.
22
,
25
(
1997
).
4.
A.
Hintz
and
K.
Schünemann
,
Solid-State Electron.
35
,
165
(
1992
).
5.
B. A.
Glavin
,
V. I.
Pipa
,
V. V.
Mitin
, and
M. A.
Stroscio
,
Phys. Rev. B
65
,
205315
(
2002
).
6.
P.
Harrison
,
Quantum Wells, Wires and Dots
(
John Wiley & Sons
,
Chichester
,
2005
).
7.
A.
Mošková
and
M.
Moško
,
Phys. Rev. B
61
,
3048
(
2000
).
8.
L. S.
Tan
,
S. J.
Chua
, and
V. K.
Arora
,
Phys. Rev. B
47
,
13868
(
1993
).
9.
N.
Fitzer
,
A.
Kuligk
,
R.
Redmer
,
M.
Städele
,
S. M.
Goodnick
, and
W.
Schattke
,
Phys. Rev. B
67
,
201201
(
2003
).
10.
Y. M.
Hsin
,
W. B.
Tang
, and
H. T.
Hsu
,
Solid-State Electron.
49
,
295
(
2005
).
11.
L. E.
Vorobjev
,
S. N.
Danilov
,
V. L.
Zerova
, and
D. A.
Firsov
,
Fiz. Tekh. Poluprovodn. (S.-Peterburg)
37
,
604
(
2003
).
12.
V.
Milanović
and
Z.
Ikonić
,
Phys. Rev. B
54
,
1998
(
1996
).
13.
R.
Reeder
,
A.
Udal
,
E.
Velmre
, and
P.
Harrison
,
Proceedings of the 10th Biennial Baltic Electronics Conference
, Tallinn, Estonia, 2–4 Oct 2006, IEEE Cat. No. 06EX1395(2006), p.
51
,
Publ. Tallinn University of Technology
,
Tallinn, Estonia
(
2006
).
14.
V.
Milanović
and
Z.
Ikonić
,
IEEE J. Quantum Electron.
32
,
1316
(
1996
).
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