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

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.

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 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

Various Liquid Crystal Alignments on Fluorinated Diamond-Like Carbon Layer by Ion Beam Treatment

2007 ◽  
Vol 46 (6A) ◽  
pp. 3521-3523 ◽  
Author(s):  
Han Jin Ahn ◽  
Kyung Chan Kim ◽  
Jong Bok Kim ◽  
Byoung Har Hwang
Keyword(s):  
Liquid Crystal ◽  
Ion Beam ◽  
Carbon Layer ◽  
Diamond Like Carbon ◽  
Ion Beam Treatment

scholarly journals Photonic bandgaps in selectively filled photonic crystal fibers

2017 ◽  
Vol 9 (3) ◽  
pp. 79 ◽  
Author(s):  
Olga H. Jaworska ◽  
Sławomir Ertman
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystal ◽  
Optical Fibers ◽  
Focused Ion Beam ◽  
Photonic Crystal Fibers ◽  
Ion Beam ◽  
Photonic Bandgaps ◽  
Practical Applications ◽  
Enhanced Sensitivity ◽  
Crystal Fibers

Simulations of selectively filled photonic crystal fibers using finite elements method were performed. Different patterns of filling were modeled and compared to an empty and fully filled fiber. Dependence of effective refractive indices of guided modes, phase birefringence and confinement losses on guided wavelength was investigated. A comparison of width of photonic bandgaps in different structures was made. Full Text: PDF ReferencesPh. St. J. Russell, "Photonic-Crystal Fibers", J. Lightwave Technol. 24, 4729 (2006) CrossRef Y. Han, S. Tan, M. K. K. Oo, D. Pristinski, S. Sukhishvili, and H. Du, "Towards Full-Length Accumulative Surface-Enhanced Raman Scattering-Active Photonic Crystal Fibers", Adv. Mat. 22, 2647 (2010) CrossRef S. Ertman, A. H. Rodríguez, M. M. Tefelska, M. S. Chychłowski, D. Pysz, R. Buczyński, E. Nowinowski-Kruszelnicki, R. Dąbrowski, and T. R. Woliński, "Index Guiding Photonic Liquid Crystal Fibers for Practical Applications", J. Lightwave Technol. 30, 1208 (2012) CrossRef K. Mileńko, S. Ertman, T. R. Woliński, "Numerical Analysis of the Phase Birefringence of the Photonic Crystal Fibers Selectively Filled with Liquid Crystal", Mol. Cryst. Liq. Cryst. 596, 4 (2014) CrossRef Y. Wang, C. Liao, X. Zhong, Z. Li, Y. Liu, J. Zhou, and K. Yang, "Selective-fluid-filled photonic crystal fibers and applications", Proc. SPIE 8914, 89140J-1 (2013) CrossRef F. Wang, W. Yuan, O. Hansen, and O. Bang, "Selective filling of photonic crystal fibers using focused ion beam milled microchannels", Opt. Express 19, 17585 (2011) CrossRef T. Martynkien, G. Statkiewicz-Barabach, J. Olszewski et al., "Highly birefringent microstructured fibers with enhanced sensitivity to hydrostatic pressure", Opt. Express 18, 15113 (2010) CrossRef B. T. Kuhlmey, R.C. McPhedran, C. M. de Sterke, "Modal cutoff in microstructured optical fibers", Opt. Lett. 27, 1684 (2002) CrossRef

Delicate Modification of Poly(dimethylsiloxane) Ultrathin Film by Low-Energy Ion Beam Treatment for Durable Intermediate Liquid Crystal Pretilt Angles

Langmuir ◽  
2010 ◽  
Vol 26 (7) ◽  
pp. 5072-5076 ◽  
Author(s):  
Byoung Har Hwang ◽  
Chu Ji Choi ◽  
Min Kyoung Jo ◽  
Jong Bok Kim ◽  
Hae Min Choe ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ion Beam ◽  
Ultrathin Film ◽  
Low Energy ◽  
Ion Beam Treatment ◽  
Pretilt Angles

Improved performance of ZnO nanowire field-effect transistors via focused ion beam treatment

2011 ◽  
Vol 22 (37) ◽  
pp. 375201 ◽  
Author(s):  
Zhi-Min Liao ◽  
Yi Lu ◽  
Han-Chun Wu ◽  
Ya-Qing Bie ◽  
Yang-Bo Zhou ◽  
...  
Keyword(s):  
Field Effect ◽  
Focused Ion Beam ◽  
Field Effect Transistors ◽  
Ion Beam ◽  
Zno Nanowire ◽  
Ion Beam Treatment ◽  
Improved Performance

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.

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