We present a technique for measuring radio-frequency (RF) electric field strengths with sub-wavelength resolution. We use Rydberg states of rubidium atoms to probe the RF field. The RF field causes an energy splitting of the Rydberg states via the Autler-Townes effect, and we detect the splitting via electromagnetically induced transparency (EIT). We use this technique to measure the electric field distribution inside a glass cylinder with applied RF fields at 17.04 GHz and 104.77 GHz. We achieve a spatial resolution of 100μm, limited by the widths of the laser beams utilized for the EIT spectroscopy. We numerically simulate the fields in the glass cylinder and find good agreement with the measured fields. Our results suggest that this technique could be applied to image fields on a small spatial scale over a large range of frequencies, up into the sub-terahertz regime.

1.
M.
Kanda
and
L.
Driver
,
IEEE Trans. Microwave Theory Tech.
35
,
124
130
(
1987
).
2.
C. L.
Holloway
,
E. F.
Kuester
,
J. A.
Gordon
,
J.
O'Hara
,
J.
Booth
, and
D. R.
Smith
,
IEEE Antennas Propag. Mag.
54
,
10
35
(
2012
).
3.
J. A.
Sedlacek
,
A.
Schwettmann
,
H.
Kübler
,
R.
Löw
,
T.
Pfau
, and
J. P.
Shaffer
,
Nat. Phys.
8
,
819
(
2012
).
4.
C. L.
Holloway
,
J. A.
Gordon
,
S.
Jefferts
,
A.
Schwarzkopf
,
D. A.
Anderson
,
S. A.
Miller
,
N.
Thaicharoen
, and
G.
Raithel
, “
Broadband Rydberg Atom-Based Electric-Field Probe: From Self-Calibrating Measurements to Sub-Wavelength Imaging
,” IEEE Trans. Antennas and Propag. (submitted); arXiv:1405.7066.
5.
J. A.
Sedlacek
,
A.
Schwettmann
,
H.
Kübler
, and
J. P.
Shaffer
,
Phys. Rev. Lett.
111
,
063001
(
2013
).
6.
J. A.
Gordon
,
C. L.
Holloway
,
S.
Jefferts
, and
T.
Heavner
, in
Proceedings of the International Symposium on Electromagnetic Compatibility
, Fort Lauderdale, FL (
2010
), pp.
321
324
.
7.
J. A.
Gordon
,
C. L.
Holloway
,
A.
Schwarzkopf
,
D. A.
Anderson
,
S. A.
Miller
,
N.
Thaicharoen
, and
G.
Raithel
, “Millimeter Wave Detection via Autler-Townes Splitting in Rubidium Rydberg Atoms,”
Appl. Phys. Lett.
(submitted).
8.
S. H.
Autler
and
C. H.
Townes
,
Phy. Rev.
100
,
703
722
(
1955
).
9.
M.
Fleischhauer
,
A.
Imamoglu
, and
J. P.
Marangos
,
Rev. Mod. Phys.
77
,
633
673
(
2005
).
10.
K. J.
Boller
,
A.
Imamolu
, and
S.
Ee Harris
,
Phys. Rev. Lett.
66
,
2593
2596
(
1991
).
11.
M. D.
Lukin
,
S. F.
Yelin
,
M.
Fleischhauer
, and
M. O.
Scully
,
Phys. Rev. A
60
,
3225
(
1999
).
12.
B. K.
Dutta
and
P. K.
Mahapatra
,
Phys. Scr.
75
,
345
(
2007
).
13.
T. Y.
Abi-Salloum
,
Phys. Rev. A
81
,
053836
(
2010
).
14.
A. K.
Mohapatra
,
T. R.
Jackson
, and
C. S.
Adams
,
Phys. Rev. Lett.
98
,
113003
(
2007
).
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