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首页金属-介电-金属复合矩形条阵列调谐双带红外偏振滤波器
金属-介电-金属复合矩形条阵列调谐双带红外偏振滤波器
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更新于2024-08-27
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本文档探讨了一种新型的可调双频红外极化滤波器的设计与研究。该滤波器利用了金属-介电-金属复合结构的完美吸收特性,通过调控反射谱来实现对红外光的特定波段选择。滤波器由三个主要部分组成:最上层是复合金属纳米结构阵列,采用矩形条纹设计;中间层为介电间隔层,用于调整光学性能;底层则为金属薄膜,提供必要的电磁响应。 矩形条纹阵列的金属纳米结构在设计中起到了关键作用,其尺寸、间距和形状参数的微调能够精细控制不同频率范围内的光吸收和反射。这种结构使得滤波器能够在两个特定的红外波段内表现出高透射率和选择性,即在目标波长范围内允许特定极化的红外光通过,而在其他波长下则表现为强烈的吸收或反射。因此,该设计对于红外成像、通信和传感等应用具有潜在优势,尤其是在需要精确控制红外光波长和极化方向的场景中。 研究者们通过数值模拟计算,详细分析了不同参数组合下的滤波效果,包括条纹的宽度、间距以及金属层和介电层的厚度。他们发现,这些参数的变化直接影响了滤波器的带宽、中心频率和极化选择性,为实际应用中的优化提供了理论依据。 此外,该工作还讨论了滤波器的可调性,即通过改变结构参数,可以在不改变基本设计的前提下,实现滤波器在不同环境或需求下的动态调整。这种灵活性对于需要在多波段红外环境下工作的系统来说,具有显著的优势。 这项研究不仅深化了我们对金属-介电-金属复合结构在红外光控制中的理解,还提供了一种新颖且可调的解决方案,为未来的红外光学设计开辟了新的可能性。对于从事红外技术、微纳光子学或材料科学的科研人员和工程师来说,这篇文章提供了一个有价值的研究参考和实践基础。
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Tunable dual-band infrared polarization filter based
on a metal-dielectric-metal compound
rectangular strip array
Biao Chen (陈 彪)
1
, Xiahui Zeng (曾夏辉)
2
, Xiyao Chen (陈曦曜)
2,
*,
Yuanyuan Lin (林媛媛)
1
, Yishen Qiu (邱怡申)
1
, and Hui Li (李 晖)
1
1
College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
2
Department of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350108, China
*Corresponding author: chenxy2628@aliyun.com
Received September 29, 2014; accepted December 22, 2014; posted online February 17, 2015
A tunable dual-band infrared polarization filter is proposed and investigated. Based on the perfect absorption
characteristic of the metal-dielectric-metal sandwich structure, the reflection spectrum performs as a filter. The
filter consists of three layers. The top layer is a compound metal nano-structure array comprised of rectangular
strips. The middle and bottom layers are a dielectric spacer and metal film, respectively. The calculated results
show that the filter properties are closely related to the polarization of the incident light. Different dual-band
wavelengths are filtered while the incident light has different polarizations, which are parallel or vertical to the x
axis. Moreover, it is found that the resonant wavelength strongly depends on the length of the rectangular strip
(which causes the resonant effect) and is independent of other strips. Therefore, the filter wavelengths can be
tuned freely by adjusting the length of the corresponding rectangular strip. In addition, the calculated results
show that all of the intensities at the filter wavelengths are closed to zero, which implies that the filter exhibits
good filtering performance.
OCIS codes: 130.0130, 130.7408, 130.3990.
doi: 10.3788/COL201513.031301.
Nanoplasmonic devices have attracted considerable inter-
est due to their unique ability to manipulate light in sub-
wavelength optics fields. In these plasmonic devices,
surface plasmons (SPs)
[1,2]
are utilized to enhance the op-
tical field intensity and overcome the classical diffraction
limit. Recently, many devices based on SPs have been
proposed and applied widely, such as plasmonic nanocav-
ities
[3]
, imaging systems
[4,5]
, transistors
[6,7]
, absorbers
[8,9]
,
and sensors
[10–13]
. Among these devices, absorbers have
achieved rapid development (due to their ultra-strong
ability of absorbing electromagnetic waves and freely tun-
ing the absorption wavelength) since a perfect absorber
was proposed
[8,14–16]
. Moreover, a plasmonic absorber is
small. With these two properties, the absorber can be well-
applied to increase the sensitivity of the detector and
reduce the noise.
In order to increase the absorption efficiency, the
absorbers are designed to possess wide-angle, polarization-
insensitive absorption
[17,18]
. Much research has been done
toward obtaining a better-performing absorber. During
this investigative process, researchers have found that
an absorber can be applied toward developing a filter
which yields a reflection spectrum that performs as a filter.
In 2001, a band-stop filter with a broader stop band for
space transmission was realized by making use of plasmon
hybridization
[19]
.
Moreover, in 2012, a tunable plasmonic polarization
filter based on a metal elliptical disc resonator was re-
ported
[20]
. The frequency of the polarized light can be
tuned by changing the axis ratio of the elliptical disc.
Unlike the developmental trend of the absorber, the filter
is designed in order to obtain polarization-dependent
absorption. The resonant wavelength depends on the light
polarization. However, it is obvious that the reported
polarization filter only exhibits a single-band filter prop-
erty. Furthermore, the elliptica l shape imparts strict
demands on the fabrication process and the modulation
range is limited. In order to obtain a polarization filter
with better performance, an asymmetrical cross-shaped
structure is considered as a favorable choice because that
it is sensitive to the light polarization and can be fabri-
cated and adjusted easily
[21]
.
In this Letter, a tunable dual-band infrared polarization
filter based on a metal-dielectric-metal compound rectan-
gular strip array is investigated by the finite difference
time-domain (FDTD) method. First, a polarization filter
that possesses dual-band filter properties for E
x
polariza-
tion and a single band for E
y
polarization is realized. Sec-
ond, two asymmetrical cross resonators formed by four
strips are used to realize a tunable dual-band filter for both
polarizations at the same time. The calculated results
show that the filtered wavelength (resonant wavelength)
is strongly dependent on the length of the strip which
caused the resonant effect. Thus the resonant wavelength
for a different polarization can be modulated by adjusting
the length of the corresponding strip. In addition, it can be
seen that the filter exhibits good filtering performance in
the wavelength range of interest because the intensities at
the filter wavelengths are close to zero.
A schematic of the polarization filter cell structure is
shown in Fig.
1. This structure can act as a polarization
filter that has dual-band filter properties for E
x
COL 13(3), 031301(2015) CHINESE OPTICS LETTERS March 10, 2015
1671-7694/2015/031301(5) 031301-1 © 2015 Chinese Optics Letters
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