Liquid-Crystal Metasurfaces Self-Assembled on Focused Ion Beam Patterned Polymer Layers: Electro-Optical Control of Light Diffraction and Transmission

2020 ◽  
Vol 12 (27) ◽  
pp. 30815-30823 ◽  
Author(s):  
Maxim V. Gorkunov ◽  
Irina V. Kasyanova ◽  
Vladimir V. Artemov ◽  
Alexander A. Ezhov ◽  
Alena V. Mamonova ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Light Diffraction ◽  
Optical Control ◽  
Polymer Layers ◽  
Self Assembled

scholarly journals Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

2019 ◽  
Vol 10 ◽  
pp. 1691-1697 ◽  
Author(s):  
Maxim V Gorkunov ◽  
Irina V Kasyanova ◽  
Vladimir V Artemov ◽  
Alena V Mamonova ◽  
Serguei P Palto
Keyword(s):  
Liquid Crystal ◽  
Optical Switching ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Polymer Surfaces ◽  
Polymer Layers ◽  
Crystal Alignment ◽  
The Difference ◽  
Micrometer Size ◽  
Pretilt Angle

Background: The alignment of liquid crystals by surfaces is crucial for applications. It determines the director configuration in the bulk, its stability against defects and electro-optical switching scenarios. The conventional planar alignment of rubbed polymer layers can be locally flipped to vertical by irradiation with a focused ion beam on a scale of tens of nanometers. Results: We propose a digital method to precisely steer the liquid crystal director tilt at polymer surfaces by combining micrometer-size areas treated with focused ion beam and pristine areas. The liquid crystal tends to average the competing vertical and planar alignment actions and is stabilized with an intermediate pretilt angle determined by the local pattern duty factor. In particular, we create micrometer-sized periodic stripe patterns with this factor gradually varying from 0 to 1. Our optical studies confirm a predictable alignment of a nematic liquid crystal with the pretilt angle continuously changing from 0° to 90°. A one-constant model neglecting the difference between the elastic moduli reproduces the results quantitatively correctly. Conclusion: The possibility of nanofabrication of polymer substrates supporting an arbitrary (from planar to vertical) spatially inhomogeneous liquid crystal alignment opens up prospects of “imprinting” electrically tunable versatile metasurfaces constituting lenses, prisms and q-plates.

scholarly journals Focused ion beam milling of self-assembled magnetic superstructures: an approach to fabricate nanoporous materials with tunable porosity

2018 ◽  
Vol 5 (6) ◽  
pp. 1211-1218 ◽  
Author(s):  
Verner Håkonsen ◽  
Gurvinder Singh ◽  
Jianying He ◽  
Zhiliang Zhang
Keyword(s):  
Porous Materials ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Nanoporous Materials ◽  
Porous Network ◽  
Novel Approach ◽  
Self Assembled ◽  
Focused Ion Beam Milling

Focused ion beam milling of self-assembled magnetic superstructures is demonstrated as a novel approach to fabricate porous materials with tunable porosity. During exposure to the ion beam, nanoparticles in the superstructure are subjected to combined milling and melting, thus merging together into a porous network.

scholarly journals Functional Photonic Elements Based on Liquid Crystal Metasurfaces

2021 ◽  
Vol 2015 (1) ◽  
pp. 012050
Author(s):  
Maxim V. Gorkunov ◽  
Irina V. Kasyanova ◽  
Vladimir V. Artemov ◽  
Artur R. Geivandov ◽  
Ivan V. Simdyankin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Soft Matter ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Beam Splitting ◽  
Beam Path ◽  
Self Assembling ◽  
Alignment Layers ◽  
Polymer Alignment

Abstract We study versatile soft-matter metasurfaces based on self-assembling of nematic liquid crystal on polymer alignment layers processed with a focused ion beam. Digital control of the beam path allows imprinting patterns that induce different complex distributions of the refractive index within several micrometer thick liquid crystal layers. We optimize them to implement various optical functionalities, such as broadband anomalous refraction, wide-aperture focusing, and beam splitting in tens of channels.

Preferential ordering of self-assembled Ge islands on focused ion-beam patterned Si(100)

2012 ◽  
Vol 14 (2) ◽  
Author(s):  
K. Das ◽  
S. Das ◽  
R. K. Singha ◽  
S. K. Ray ◽  
A. K. Raychaudhuri
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Self Assembled

Formation of self-assembled Ga-rich droplet chains on GaAs (100) patterned by focused ion beam

2016 ◽  
Vol 109 (12) ◽  
pp. 123102
Author(s):  
Sabina D. Koukourinkova ◽  
Mourad Benamara ◽  
Morgan E. Ware ◽  
Zhiming M. Wang ◽  
Gregory J. Salamo
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Self Assembled

Tuning Surface Wettability at the Submicron-Scale: Effect of Focused Ion Beam Irradiation on a Self-Assembled Monolayer

2015 ◽  
Vol 120 (1) ◽  
pp. 274-280 ◽  
Author(s):  
Yutaka Yamada ◽  
Koji Takahashi ◽  
Tatsuya Ikuta ◽  
Takashi Nishiyama ◽  
Yasuyuki Takata ◽  
...  
Keyword(s):  
Scale Effect ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Surface Wettability ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Self Assembled Monolayer ◽  
Submicron Scale ◽  
Self Assembled

Microscopic Studies of Alignment Layers Processed by a Focused Ion Beam for the Creation of Liquid Crystal Metasurfaces

2021 ◽  
Vol 66 (4) ◽  
pp. 673-681
Author(s):  
V. V. Artemov ◽  
D. N. Khmelinin ◽  
A. V. Mamonova ◽  
M. V. Gorkunov ◽  
A. A. Ezhov
Keyword(s):  
Liquid Crystal ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Microscopic Studies ◽  
The Creation ◽  
Alignment Layers

Liquid crystal microlenses based on binary surface alignment controlled by focused ion beam treatment

2021 ◽  
Author(s):  
Serguei Palto ◽  
Artur Geivandov ◽  
Irina Kasyanova ◽  
Ivan Simdyankin ◽  
Vladimir Artemov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Surface Alignment ◽  
Ion Beam Treatment
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