Mike Pivnenko
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View article: High-efficiency phase modulation in LCoS-compatible LC-metasurface via spacer integration and Oseen-Frank modeling
High-efficiency phase modulation in LCoS-compatible LC-metasurface via spacer integration and Oseen-Frank modeling Open
A liquid crystal (LC)-tunable metasurface offers a promising route to extend the functionality of liquid crystal on silicon (LCoS) spatial light modulators (SLM) by enabling fast phase control and potential polarization insensitivity. Howe…
View article: Electrically Tunable Geometric-Phase Optical Element with Hybrid Retardation and Subwavelength Pixel Size Enabled by Metasurface-Induced Liquid Crystal Patterning
Electrically Tunable Geometric-Phase Optical Element with Hybrid Retardation and Subwavelength Pixel Size Enabled by Metasurface-Induced Liquid Crystal Patterning Open
In this work, we present an electrically tunable hybrid geometric phase optical element (GPOE) at a telecommunication wavelength with the geometric phase jointly imparted by a liquid crystal (LC) layer and the embedded metasurface. A geome…
View article: Fast-speed electrically tunable liquid crystal metasurface for 2π phase modulation at normal and oblique angles of incidence
Fast-speed electrically tunable liquid crystal metasurface for 2π phase modulation at normal and oblique angles of incidence Open
This study presents an electrically tunable metasurface capable of achieving continuous 2π phase modulation at normal and oblique angles of incidence with high reflectance in the telecom C-band. By using constructive interference between e…
View article: Electrically tunable Fano resonances in liquid crystal-based dynamic metasurface at telecommunication wavelengths
Electrically tunable Fano resonances in liquid crystal-based dynamic metasurface at telecommunication wavelengths Open
Dielectric metasurface has become a versatile platform for light manipulation. Due to its subwavelength feature size, the metasurface can induce optical resonances with tailored characteristics, such as Fano resonance with asymmetric line …
View article: Adaptive contrast enhancement and effect of non-linear exponential merit function on computer-generated holograms
Adaptive contrast enhancement and effect of non-linear exponential merit function on computer-generated holograms Open
A merit function that integrates energy redistribution into the Gerchberg–Saxton method for computer-generated holograms is introduced for enhancing the contrast and increasing the dynamic range of reconstructed holographic images. It empl…
View article: Liquid-crystal-based diffractive optical elements with high Pancharatnam-Berry phase accuracy for holographic displays fabricated using an optimized liquid crystal on silicon device
Liquid-crystal-based diffractive optical elements with high Pancharatnam-Berry phase accuracy for holographic displays fabricated using an optimized liquid crystal on silicon device Open
A rapid and accurate photoalignment technique was proposed for the fabrication of liquid crystal Pancharatnam-Berry phase diffractive optical elements (LC PB-DOEs). The in-plane orientation of LCs was precisely manipulated through the pola…
View article: Electrically tunable metasurface in TN LC configuration with enhanced quality factor and metaatom-induced alignment
Electrically tunable metasurface in TN LC configuration with enhanced quality factor and metaatom-induced alignment Open
Dynamic metasurface with subwavelength dimensions has emerged as a key optical technology in recent years. Although various active tuning mechanisms are being proposed, liquid crystal-based dynamic metasurface remains attractive due to its…
View article: Fast-switching reconfigurable metadevice with metasurface-induced liquid crystal alignment for light modulator applications
Fast-switching reconfigurable metadevice with metasurface-induced liquid crystal alignment for light modulator applications Open
Metasurface technology is progressing rapidly towards commercialization and productization, due to its unparallelled advantages over conventional optical solutions. The reconfigurable metasurface, exhibiting more flexibility and capacity t…
View article: Dielectric Meta-Atoms with Liquid Crystal Alignment Effect for Electrically Tunable Metasurface
Dielectric Meta-Atoms with Liquid Crystal Alignment Effect for Electrically Tunable Metasurface Open
Dielectric metasurfaces with tunable functions are increasingly appealing to both the academia and industrial communities. Among the many tuning mechanisms reported so far, metasurface immersed in liquid crystal (LC) stands out as one of t…
View article: Multi-height metasurface for wavefront manipulation fabricated by direct laser writing lithography
Multi-height metasurface for wavefront manipulation fabricated by direct laser writing lithography Open
We introduce two types of dielectric metasurfaces, consisting of 3 × 3 regions, which manipulate wavefront by different feature heights. Both polarization-dependent and polarization-independent metasurfaces are realized for phase depth of …
View article: Electrically tuned active metasurface towards metasurface-integrated liquid crystal on silicon (meta-LCoS) devices
Electrically tuned active metasurface towards metasurface-integrated liquid crystal on silicon (meta-LCoS) devices Open
Active metasurfaces add a new dimension to static metasurfaces by introducing tunability, and this has received enormous attention from industry. Although various mechanisms have been proposed over the past few years in literature, solutio…
View article: Phase flicker-induced sharpness deterioration on 2D holographic displays with digitally driven phase-only LCoS devices
Phase flicker-induced sharpness deterioration on 2D holographic displays with digitally driven phase-only LCoS devices Open
Phase flicker in liquid crystal on silicon (LCoS) devices can decrease the effective phase modulation resolution by introducing overlapped phase oscillations between adjacent modulated gray levels, thus degrading the performance of LCoS de…
View article: Increasing steering angle of LCoS in a WSS system through integration with a metasurface
Increasing steering angle of LCoS in a WSS system through integration with a metasurface Open
Liquid crystal on silicon (LCoS) has been the dominant choice for wavelength selective switches (WSSs) in telecommunication industry due to its high spatial resolution and compatibility with software defined flexible grid feature. Current …
View article: LCOS Spatial Light Modulator for Digital Holography
LCOS Spatial Light Modulator for Digital Holography Open
Liquid crystal on silicon (LCOS) spatial light modulator (SLM) is the most widely used optical engine for digital holography. This paper aims to provide an overview of the applications of phase-only LCOS in two-dimensional (2D) holography.…
View article: Effects of phase flicker in digitally driven phase-only LCOS devices on holographic reconstructed images
Effects of phase flicker in digitally driven phase-only LCOS devices on holographic reconstructed images Open
Phase flicker can degrade the performance of holographic applications at the device and application levels. On the device side, the meaningful phase modulation resolution is proved to be limited by the overlapping between adjacent phase le…
View article: Sub-millisecond switching of multi-level liquid crystal on silicon spatial light modulators for increased information bandwidth
Sub-millisecond switching of multi-level liquid crystal on silicon spatial light modulators for increased information bandwidth Open
Sub-millisecond response time with a refresh rate higher than 2000 frames per second (fps) and no degradation of the contrast ratio or diffraction efficiency is demonstrated in working liquid crystal on silicon (LCOS) spatial light modulat…
View article: Variety of Ordered Patterns in Donor–Acceptor Polymer Semiconductor Films Crystallized from Solution
Variety of Ordered Patterns in Donor–Acceptor Polymer Semiconductor Films Crystallized from Solution Open
A huge challenge is to control the nucleation of crystallites/aggregates in the solution during polymer film formation to generate desired structures. In this work, we investigate crystallization of P(NDI2OD-T2), a donor-acceptor polymer s…
View article: Implementation of 10-Bit Phase Modulation for Phase-Only LCOS Devices Using Deep Learning
Implementation of 10-Bit Phase Modulation for Phase-Only LCOS Devices Using Deep Learning Open
A deep learning model was built to optimize the phase flicker performance for given pulse width modulation (PWM) driving patterns of a liquid crystal on silicon (LCOS) device. 10-bit phase modulation was physically realized with a phase fl…
View article: Phase Distortion Corrections of Phase-Only LCoS Devices for Digital Holographic Applications
Phase Distortion Corrections of Phase-Only LCoS Devices for Digital Holographic Applications Open
© OSA 2019 © 2019 The Author(s) Significant phase distortion corrections of nearly perfect phase linearity and minimum phase flicker with doubled meaningful phase levels was achieved by optimising the digital driving patterns of phase-only…
View article: High-resolution patterning of solution-processable materials via externally engineered pinning of capillary bridges
High-resolution patterning of solution-processable materials via externally engineered pinning of capillary bridges Open
View article: Colorimetric-based Detection of TNT Explosives Using Functionalized Silica Nanoparticles
Colorimetric-based Detection of TNT Explosives Using Functionalized Silica Nanoparticles Open
This proof-of-concept study proposed a novel sensing technique for a label-free and selective detection of 2,4,6-trinitrotoluene (TNT) from 10−12 to 10−4 molar. Amine-terminated nanoparticles were used as TNT bioreceptors to form Meisenhei…
View article: Advanced die-level assembly techniques and quality analysis for phase-only liquid crystal on silicon devices
Advanced die-level assembly techniques and quality analysis for phase-only liquid crystal on silicon devices Open
In this article, quality analysis of the assembled phase-only liquid crystal on silicon devices is presented ba sed on experiences using the flexibility and scalability of die-level assembly process. The research contents mainly consist of…
View article: Fast bistable intensive light scattering in helix-free ferroelectric liquid crystals
Fast bistable intensive light scattering in helix-free ferroelectric liquid crystals Open
A new type of ferroelectric liquid crystal (FLC) is considered, where the reorientation of the director (main optical axes) at the interaction of an electric field with the FLC's spontaneous polarization is due to the movement of spatially…
View article: High-birefringence nematic liquid crystal for broadband THz applications
High-birefringence nematic liquid crystal for broadband THz applications Open
Liquid crystals (LCs) have been studied extensively in the visible range for their dielectric tunability, and the characterisation in the terahertz (THz) range has gained increasing interest due to the need for active THz modulation and sw…
View article: Uniform and fast switching of window-size smectic A liquid crystal panels utilising the field gradient generated at the fringes of patterned electrodes
Uniform and fast switching of window-size smectic A liquid crystal panels utilising the field gradient generated at the fringes of patterned electrodes Open
A method to enable smectic A (SmA) liquid crystal (LC) devices to switch uniformly and hence fast from the clear state to a scattered state is presented. It will allow the reduction of the switching time for a SmA LC panel of 1 × 1 m2 chan…
View article: Pixel-level fringing-effect model to describe the phase profile and diffraction efficiency of a liquid crystal on silicon device
Pixel-level fringing-effect model to describe the phase profile and diffraction efficiency of a liquid crystal on silicon device Open
We propose a fringing-effect model based on the experimentally measured phase response across the phase transition region of a liquid crystal on silicon (LCOS) device. The measured phase profile in the phase transition region is characteri…
View article: Colorimetric-Based Detection of TNT Explosives Using Functionalized Silica Nanoparticles
Colorimetric-Based Detection of TNT Explosives Using Functionalized Silica Nanoparticles Open
This proof-of-concept study proposes a novel sensing mechanism for selective and label-free detection of 2,4,6-trinitrotoluene (TNT). It is realized by surface chemistry functionalization of silica nanoparticles (NPs) with 3-aminopropyl-tr…