We report on liquid-based tunable microlenses actuated by infrared (IR) light. Multiple micropost structures, made of IR light-responsive hydrogel with entrapped gold nanoparticles, are photopatterned around a lens aperture. The volumetric change in the hydrogel, controlled by IR light, regulates the curvature of a liquid-liquid interface forming the microlens at the aperture and its focal length. The focal length of the microlens can be tuned from 17.4mmto+8.0±0.4mm in seconds under IR irradiation. This microlens can be integrated into optical systems, for instance, for fiber endoscopy.

1.
S.
Kuiper
and
B. H. W.
Hendriks
,
Appl. Phys. Lett.
85
,
1128
(
2004
).
2.
K.
Carlson
,
M.
Chidley
,
K. B.
Sung
,
M.
Descour
,
A.
Gillenwater
,
M.
Follen
, and
R.
Richards-Kortum
,
Appl. Opt.
44
,
1792
(
2005
).
3.
H.
Ren
and
S. T.
Wu
,
Appl. Phys. Lett.
86
,
211107
(
2005
).
4.
K. H.
Jeong
,
G. L.
Liu
,
N.
Chronis
, and
L. P.
Lee
,
Opt. Express
12
,
2494
(
2004
).
5.
D. Y.
Zhang
,
V.
Lien
,
Y.
Berdichevsky
,
J.
Choi
, and
Y. H.
Lo
,
Appl. Phys. Lett.
82
,
3171
(
2003
).
6.
C. A.
Lopez
,
C. C.
Lee
, and
A. H.
Hirsa
,
Appl. Phys. Lett.
87
,
134102
(
2005
).
7.
S.
Yang
,
T. N.
Krupenkin
,
P.
Mach
, and
E. A.
Chandross
,
Adv. Mater. (Weinheim, Ger.)
15
,
940
(
2003
).
8.
L.
Dong
,
A. K.
Agarwal
,
D. J.
Beebe
, and
H.
Jiang
,
Nature (London)
442
,
551
(
2006
).
9.
L.
Dong
,
A. K.
Agarwal
,
D. J.
Beebe
, and
H.
Jiang
,
Adv. Mater. (Weinheim, Ger.)
19
,
401
(
2007
).
10.
D. J.
Beebe
,
J. S.
Moore
,
J. M.
Bauer
,
Q.
Yu
,
R. H.
Liu
,
C.
Devadoss
, and
B. H.
Jo
,
Nature (London)
404
,
588
(
2000
).
11.
A. K.
Agarwal
,
S. S.
Sridharamurthy
,
D. J.
Beebe
, and
H.
Jiang
,
J. Microelectromech. Syst.
14
,
1409
(
2005
).
12.
S. R.
Sershen
,
G. A.
Mensing
,
M.
Ng
,
N. J.
Halas
,
D. J.
Beebe
, and
J. L.
West
,
Adv. Mater. (Weinheim, Ger.)
17
,
1366
(
2005
).
13.
L.
Dong
and
H.
Jiang
,
Appl. Phys. Lett.
89
,
211120
(
2006
).
14.
M.
Brust
,
M.
Walker
,
D.
Bethell
,
D. J.
Schiffrin
, and
R.
Whyman
,
J. Chem. Soc., Chem. Commun.
1994
,
801
.
15.
A. H.
Latham
and
M. E.
Williams
,
Langmuir
22
,
4319
(
2006
).
16.
See EPAPS Document No. E-APPLAB-93-001841 for the absorption spectra of materials involved and a video showing the operation of the tunable lens. For more information on EPAPS, see http://www.aip.org/pubservs/epaps.html.
17.
S.
Thorslund
and
F.
Nikolajeff
,
J. Micromech. Microeng.
17
,
N16
(
2007
).
18.
X.
Zeng
and
H.
Jiang
, “
Polydimethylsiloxane microlens arrays fabricated through liquid-phase photopolymerization and molding
,”
J. Microelectromech. Syst.
(to be published).

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