Terahertz (THz) metadevices featured by high-Q Fano resonance are applicable for ultrasensitive biodetection. The active tuning of Fano resonance further extends their applications to switching and filtering. Here, we propose a dynamic Fano cloaking in a liquid crystal (LC) integrated THz metasurface. The metasurface is composed of two-gap asymmetric split rings. Its Fano resonance is intensively dependent on the incident polarization. The Fano resonance occurs when illuminated by THz waves with polarization perpendicular to the gaps, while for parallel polarization, the Fano resonance vanishes, namely, the cloaking of Fano resonators. A 250-μm-thick LC layer functions as an integrated tunable polarization converter. Thus, the device can be electrically switched between the sharp Fano state and the high-transmission state. The modulation depth reaches over 50% in a broad frequency range of 660 GHz. This work may inspire various advanced active THz apparatuses for biosensing, switching, and filtering.

1.
B.
Ferguson
and
X. C.
Zhang
,
Nat. Mater.
1
,
26
(
2002
);
[PubMed]
S.
Koenig
,
D.
Lopez-Diaz
,
J.
Antes
,
F.
Boes
,
R.
Henneberger
,
A.
Leuther
,
A.
Tessmann
,
R.
Schmogrow
,
D.
Hillerkuss
,
R.
Palmer
,
T.
Zwick
,
C.
Koos
,
W.
Freude
,
O.
Ambacher
,
J.
Leuthold
, and
I.
Kallfass
,
Nat. Photonics
7
,
977
(
2013
).
2.
K.
Kawase
,
Y.
Ogawa
,
Y.
Watanabe
, and
H.
Inoue
,
Opt. Express
11
,
2549
(
2003
).
3.
W.
Xu
,
L.
Xie
, and
Y.
Ying
,
Nanoscale
9
,
13864
(
2017
).
4.
Y.
Zhang
,
T.
Li
,
B.
Zeng
,
H.
Zhang
,
H.
Lv
,
X.
Huang
,
W.
Zhang
, and
A. K.
Azad
,
Nanoscale
7
,
12682
(
2015
);
[PubMed]
L.
Cong
,
Y. K.
Srivastava
, and
R.
Singh
,
Appl. Phys. Lett.
111
,
081108
(
2017
);
R.
Singh
,
W.
Cao
,
I.
Al-Naib
,
L.
Cong
,
W.
Withayachumnankul
, and
W.
Zhang
,
Appl. Phys. Lett.
105
,
171101
(
2014
).
B.
Luk'yanchuk
,
N. I.
Zheludev
,
S. A.
Maier
,
N. J.
Halas
,
P.
Nordlander
,
H.
Giessen
, and
C. T.
Chong
,
Nat. Mater.
9
,
707
(
2010
);
[PubMed]
M. F.
Limonov
,
M. V.
Rybin
,
A. N.
Poddubny
, and
Y. S.
Kivshar
,
Nat. Photonics
11
,
543
(
2017
).
6.
N.
Yu
and
F.
Capasso
,
Nat. Mater.
13
,
139
(
2014
);
[PubMed]
H.
Zhang
,
X.
Zhang
,
Q.
Xu
,
C.
Tian
,
Q.
Wang
,
Y.
Xu
,
Y.
Li
,
J.
Gu
,
Z.
Tian
,
C.
Ouyang
,
X.
Zhang
,
C.
Hu
,
J.
Han
, and
W.
Zhang
,
Adv. Opt. Mater.
6
,
1700773
(
2018
);
L.
Gao
,
Q.
Cheng
,
J.
Yang
,
S.
Ma
,
J.
Zhao
,
S.
Liu
,
H.
Chen
,
Q.
He
,
W.
Jiang
,
H.
Ma
,
Q.
Wen
,
L.
Liang
,
B.
Jin
,
W.
Liu
,
L.
Zhou
,
J.
Yao
,
P.
Wu
, and
T.
Cui
,
Light Sci. Appl.
4
,
e324
(
2015
);
Q.
Wang
,
X.
Zhang
,
Y.
Xu
,
Z.
Tian
,
J.
Gu
,
W.
Yue
,
S.
Zhang
,
J.
Han
, and
W.
Zhang
,
Adv. Opt. Mater.
3
,
779
(
2015
);
Q.
Wang
,
X.
Zhang
,
E.
Plum
,
Q.
Xu
,
M.
Wei
,
Y.
Xu
,
H.
Zhang
,
Y.
Liao
,
J.
Gu
,
J.
Han
, and
W.
Zhang
,
Adv. Opt. Mater.
5
,
1700277
(
2017
).
7.
R.
Singh
,
I. A. I.
Al-Naib
,
M.
Koch
, and
W.
Zhang
,
Opt. Express
19
,
6312
(
2011
);
[PubMed]
W.
Cao
,
R.
Singh
,
I. A. I.
Al-Naib
,
M.
He
,
A. J.
Taylor
, and
W.
Zhang
,
Opt. Lett.
37
,
3366
(
2012
).
[PubMed]
8.
M.
Manjappa
,
Y. K.
Srivastava
,
L.
Cong
,
I.
Al-Naib
, and
R.
Singh
,
Adv. Mater.
29
,
1603355
(
2017
);
J.
Gu
,
R.
Singh
,
X.
Liu
,
X.
Zhang
,
Y.
Ma
,
S.
Zhang
,
S. A.
Maier
,
Z.
Tian
,
A. K.
Azad
,
H.
Chen
,
A. J.
Taylor
,
J.
Han
, and
W.
Zhang
,
Nat. Commun.
3
,
1151
(
2012
).
[PubMed]
9.
L.
Cong
,
Y. K.
Srivastava
,
A.
Solanki
,
T. C.
Sum
, and
R.
Singh
,
ACS Photonics
4
,
1595
(
2017
).
10.
Z. X.
Chen
,
J. H.
Chen
,
Z. J.
Wu
,
W.
Hu
,
X. J.
Zhang
, and
Y. Q.
Lu
,
Appl. Phys. Lett.
104
,
161114
(
2014
);
N. K.
Emani
,
T.
Chung
,
A. V.
Kildishev
,
V. M.
Shalaev
,
Y. P.
Chen
, and
A.
Boltasseva
,
Nano Lett.
14
,
78
(
2014
).
[PubMed]
11.
Y. K.
Srivastava
,
A.
Chaturvedi
,
M.
Manjappa
,
A.
Kumar
,
G.
Dayal
,
C.
Kloc
, and
R.
Singh
,
Adv. Opt. Mater.
5
,
1700762
(
2017
).
12.
X.
Lin
,
J.
Wu
,
W.
Hu
,
Z.
Zheng
,
Z.
Wu
,
G.
Zhu
,
F.
Xu
,
B.
Jin
, and
Y.
Lu
,
AIP Adv.
1
,
032133
(
2011
);
Y. Y.
Ji
,
F.
Fan
,
M.
Chen
,
L.
Yang
, and
S. J.
Chang
,
Opt. Express
25
,
11405
(
2017
).
[PubMed]
13.
C.
Hsieh
,
R.
Pan
,
T.
Tang
,
H.
Chen
, and
C.
Pan
,
Opt. Lett.
31
,
1112
(
2006
).
14.
L.
Wang
,
X.
Lin
,
W.
Hu
,
G.
Shao
,
P.
Chen
,
L.
Liang
,
B.
Jin
,
P.
Wu
,
H.
Qian
,
Y.
Lu
,
X.
Liang
,
Z.
Zheng
, and
Y.
Lu
,
Light Sci. Appl.
4
,
e253
(
2015
).
15.
S. J.
Ge
,
P.
Chen
,
Z. X.
Shen
,
W. F.
Sun
,
X. K.
Wang
,
W.
Hu
,
Y.
Zhang
, and
Y. Q.
Lu
,
Opt. Express
25
,
12349
(
2017
).
16.
D.
Shrekenhamer
,
W.
Chen
, and
W. J.
Padilla
,
Phys. Rev. Lett.
110
,
177403
(
2013
);
[PubMed]
Z.
Shen
,
S.
Zhou
,
S.
Ge
,
W.
Duan
,
P.
Chen
,
L.
Wang
,
W.
Hu
, and
Y.
Lu
,
Opt. Lett.
43
,
4695
(
2018
).
[PubMed]
17.
P.
Chen
,
L.
Ma
,
W.
Duan
,
J.
Chen
,
S.
Ge
,
Z.
Zhu
,
M.
Tang
,
R.
Xu
,
W.
Gao
,
T.
Li
,
W.
Hu
, and
Y.
Lu
,
Adv. Mater.
30
,
1705865
(
2018
).
18.
L.
Wang
,
X.
Lin
,
X.
Liang
,
J.
Wu
,
W.
Hu
,
Z.
Zheng
,
B.
Jin
,
Y.
Qin
, and
Y.
Lu
,
Opt. Mater. Express
2
,
1314
(
2012
).
19.
L.
Cong
,
M.
Manjappa
,
N.
Xu
,
I.
Al-Naib
,
W.
Zhang
, and
R.
Singh
,
Adv. Opt. Mater.
3
,
1537
(
2015
).
20.
X.
Zhao
,
J.
Schalch
,
J.
Zhang
,
H. R.
Seren
,
G.
Duan
,
R. D.
Averitt
, and
X.
Zhang
,
Optica
5
,
303
(
2018
).
21.
Y.
Wu
,
X.
Ruan
,
C.
Chen
,
Y. J.
Shin
,
Y.
Lee
,
J.
Niu
,
J.
Liu
,
Y.
Chen
,
K.
Yang
,
X.
Zhang
,
J.
Ahn
, and
H.
Yang
,
Opt. Express
21
,
21395
(
2013
);
[PubMed]
L.
Wang
,
S.
Ge
,
W.
Hu
,
M.
Nakajima
, and
Y.
Lu
,
Opt. Express
25
,
23873
(
2017
).
[PubMed]
22.
M. C.
Nuss
and
J.
Orenstein
,
Millimeter and Submillimeter Wave Spectroscopy of Solids
(
Springer
,
Berlin, Heidelberg
,
1998
).
23.
X.
Lin
,
W.
Hu
,
X.
Hu
,
X.
Liang
,
Y.
Chen
,
H.
Cui
,
G.
Zhu
,
J.
Li
,
V.
Chigrinov
, and
Y.
Lu
,
Opt. Lett.
37
,
3627
(
2012
).
24.
M.
Decker
,
C.
Kremers
,
A.
Minovich
,
I.
Staude
,
A. E.
Miroshnichenko
,
D.
Chigrin
,
D. N.
Neshev
,
C.
Jagadish
, and
Y. S.
Kivshar
,
Opt. Express
21
,
8879
(
2013
).
25.
J.
Wu
,
B.
Jin
,
J.
Wan
,
L.
Liang
,
Y.
Zhang
,
T.
Jia
,
C.
Cao
,
L.
Kang
,
W.
Xu
,
J.
Chen
, and
P.
Wu
,
Appl. Phys. Lett.
99
,
161113
(
2011
).
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