FerroelectricliquidcrystalsforfastswitchablecircularDammanngrating[Invited]资源-CSDN文库

71 浏览量 2021-01-26 03:26:27 上传评论收藏 519KB PDF 举报

资源推荐

资源详情

资源评论

Ferroelectric liquid crystals for fast switchable

circular Dammann grating [Invited]

Qi Guo (郭琦)

1,2,

*, Tian Liu (刘恬)

1,2

, Xiaoqian Wang (王骁乾)

**,

Zhigang Zheng (郑致刚)

, Aleksey Kudreyko

, Huijie Zhao (赵慧洁)

1,2

V. Chigrinov

5,6,7

, and Hoi-Sing Kwok (郭海成)

School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China

Beihang University Qingdao Research Institute, Qingdao 266101, China

Physics Department, East China University of Science and Technology, Shanghai 200237, China

Department of Medical Physics and Informatics, Bashkir State Medical University, Ufa 450008, Russia

School of Physics and Optoelectronic Engineering , Foshan University, Foshan 528000, China

State Key Laboratory on Advanced Displays and Optoelectronics Technologies,

The Hong Kong University of Science and Technology, Hong Kong 999077, China

Department of Theoretical Physics, Moscow Region State University, Mytishi 141014, Russia

*Corresponding author: qguo@buaa.edu.cn; **corresponding author: xqwang@ecust.edu.cn

Received May 19, 2020; accepted June 3, 2020; posted online June 30, 2020

Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applica-

tions in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals (FLCs) with photo-

alignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this

study we demonstrate a circular Dammann grating (CDG) with a diffraction efficiency of 84.5%. The achieved

response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic

liquid crystal devices. By applying a low electric field (V = 6 V) to the FLC CDG, it is switched between the

eight-order diffractive state and the transmissive diffraction-free state.

Keywords: ferroelectric liquid crystals; photo-alignment; fast switching; diffractive optical elements.

doi: 10.3788/COL202018.080002.

Diffractive optical elements with attractive characteris-

tics, i.e., excellent performance and compact size, are be-

coming increasingly important to a wide range of optical

system technologies

[1–7]

. Thus, an effective method of

design and fabrication of fast-switchable and highly effi-

cient diffractive optical elements is in high demand.

Circular Dammann gratings (CDGs), which generate a

concentric and uniform energy distribution, have many

applications in image coding

[8,9]

, beam shaping

[10]

, vortex

manipulation

[11,12]

, and precise measurements

[13,14]

. Much

effort has been expended to enhance the efficiency and

the uniformity of CDGs by profile optimization

[15–17]

. How-

ever, realization of tunable CDGs has been accomplished

only in recent years. Electro-optical properties of nematic

liquid crystals with a patterned alignment and sensitivity

to the electric field make it possible to fabricate tunable

CDGs, albeit with a relatively slow response time

[18–20]

In terms of response time, ferroelectric liquid crystals

(FLCs) are two orders of magnitude faster than the

existing nematic liquid crystals

[21,22]

, which makes FLCs

the promising candidate for a new generation of diffractive

optical elements. However, the intrinsic helix or ferro-

electric domains in FLC can cause scattering, and conse-

quently the efficiency drops. In order to eliminate the

formation of ferroelectric domains, the alignment anchor-

ing needs to be precisely adjusted, and uniform orientation

of the helical axis can be achieved

[23]

. On the other hand,

the operating conditions of the electrically suppressed

helix mode provide a fast response of helix-free switch-

ing

[24]

. Fabrication of FLC CDGs with a fast switching,

low power consumption, and uniform energy distribution

expands possible photonics applications.

In this Letter a prototype of FLC CDGs is demon-

strated. A two-step photo-alignment technique was uti-

lized to generate the patterned orientation of FLCs to

fabricate CDGs that perform as optical ring generators

for unifor m energy distribution. The uniformity and

the efficiency of the diffractive patterns are evaluated.

In addition, the advantage of a fast electro-optical re-

sponse is exhibited.

A circular Dammann grating generates a set of concen-

tric rings with a unifor m energy distribution in the far

field, which are radially patterned. The order is defined

by the number of the diffractive rings. Radially patterned

modulation function tðrÞ of CDG with the period Λ can be

expanded in a linear combination of sine functions:

tðrÞ¼

∞

n¼1

sin



2πnr



; (1)

where r is the radial coordinate. The Fourier spectrum of

Eq. (

1) is given by

TðqÞ¼



∞

n¼1

n∕Λ

ðn∕Λ þ qÞ

3∕2

1∕2

ðq − n∕ΛÞ; (2)

COL 18(8), 080002(2020) CHINESE OPTICS LETTERS August 2020

本内容试读结束，登录后可阅读更多

下载后可阅读完整内容，剩余3页未读，立即下载

评论收藏

内容反馈

weixin_38608875

粉丝: 3
资源: 992

Ferroelectric liquid crystals for fast switchable circular Damma...

最新资源

Ferroelectric liquid crystals for fast switchable circular Damma...

Switchable

Effect of dichroic azo-dye doped on ferroelectric liquid crystals

Highly-Ordered Ferroelectric Photonic Crystals

Charge distribution into illuminated dye-doped surface stabilized ferroelectric liquid crystal cell

The THz Kerr Effect in Liquids and Ferroelectric Crystals (2010年)

Fast lateral photovoltaic effect in ferroelectric LiNbO3 single crystals

电子功用-含离子载体的铁电液晶混合物

Critical thickness for ferroelectric tunnel junction

Diffractive self-imaging based on selective etching of a ferroelectric domain inversion grating

Tunable photonic crystals based on ferroelectric and ferromagnetic materials by focused ion beam

phase-diagram-of-Ferroelectric.zip

ferroelectric-gate field effect transistor memories device physics&applications;

Synthesis and Ferroelectric Properties of a Couple of Chiral Europium(III) Complexes

Deep-learning-for-ferroelectric-wall-dynamics-and-pinning-mechanisms

液晶显示器行业内中英文对照表.pdf

Phase coexistence of decomposing ferroelectric solid solutions near morphotropic boundary

半导体技术 (8).pdf

LCD行业-富相科技-LCD液晶显示器驱动系統.pptx

The Static and Hyper-frequency Magnetic Properties of a Ferromagnetic-Ferroelectric Composite

行业-电子政务-手性化合物，包含这些手性化合物的胆甾型和铁电型液晶组合物，和包含这些液晶组合物的液晶显示器.zip

Influence of uniaxial compressive stress on the ferroelectric behaviors of piezoelectric stack actuators

Boost Up Carrier Mobility for Ferroelectric Organic Transistor Memory via Buffering Interfacial Polarization Fluctuation.

Fe-Doped LaNiO3 Thin Films as Electrodes for BiFeO3 Ferroelectric Thin Films

Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3

Electric fatigue in metal/ferroelectric polymer/SiO2/p-Si capacitors

Bond order loss suppressed phase stability of ferromagnetic, ferroelectric, and superconductive nanosolids

最新资源