Publications — Junseok (Justin) Ma, Ph.D.

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Journal Articles 28

2026

Concept schematic of boundary–chirality conditions in an LC reconfigurable intelligent surface

Boundary–Chirality Matching as a Design Degree of Freedom for Phase-Response Engineering in a 160-GHz Liquid-Crystal RIS

J.-S. Ma†, S. Bang†, D.-O. Kim, J. Oh, and D. K. Yoon*

IEEE Transactions on Antennas and Propagation · 2026

First authorSubmitted

J28

Concept schematic of an active–passive liquid-crystal optical stack for color generation

Electrical Translation of a Chromatic Trajectory Enables Subpixel-Free Color Generation

J.-S. Ma*, H. S. Yun, B. Kim, J. Kim, L. Wang*, J.-M. Heo*, and D. K. Yoon*

Laser & Photonics Reviews · 2026

First authorSubmitted

J27

Low-Voltage Tunable Bandpass Filter with Selective Center-Frequency and Bandwidth Control Using Liquid-Crystal-Loaded Lines

J.-Y. Choi, J.-S. Ma, J.-S. Park, W.-S. Kim*, and H.-R. Kim*

IEEE Journal of Microwaves · 2026

Submitted

J26

Dual-Parameter Control of Low-κ Liquid Crystal Polymer Films for GHz-Frequency Dielectric Applications via Porogen-Induced Porosity and Molecular Alignment

Baekman Kim†, Jongseok Kim†, Geunjung Lee†, Yeongsik Kim, Hyungju Ahn, Junseok Ma, Yun Ho Kim*, Hyun You Kim*, and Dong Ki Yoon*

Journal of Information Display · 2026

Submitted

J25

Input field passing through a printed LC droplet to produce a structured output field

Drop-on-Demand Printed Negative Dielectric Anisotropy Liquid Crystal Droplets for Adaptive Complex Beam Manipulation and Assessment

Jinge Guo†, Xuke Qiu†, Runchen Zhang, Qihao Han, Liangyu Deng, Yishun Lu, Zimo Zhao, Mengmeng Li, Waqas Kamal, Junseok Ma, Yongge Ma, Steve J. Elston, Alfonso A. Castrejón-Pita, Stephen M. Morris, and Chao He

Adv. Funct. Mater., e78645 · 2026

Published Sep 2026Paper ↗arXiv ↗

J24

Field-programmable torons in a chiral nematic LC cell: toron generation, engineered motion, reversible drift and particle transport

Field-Programmable Topological Torons in Chiral Nematic Liquid Crystals

A. Pradeep*, U. Mur, J. Qin, J. Ka, W. Kamal, T. Wang, J. Ma, S. J. Elston*, and S. M. Morris*

ACS Appl. Mater. Interfaces · 2026

Paper ↗

J23

Concept of perceptual-metric-guided occlusion patterns for OST HMDs

Reducing External Light Interference in OST HMDs via Perceptual-Metric-Guided Pattern Design

Sungeun Park, Junseok Ma, Seung-Won Oh*, and Wooksung Kim*

IEEE Photonics Technology Letters · 2026

Paper ↗

J22

Coating-free nanoscratching of PCB unit cells with a diamond lapping film

Coating-Free Nanoscratching for Liquid-Crystal Alignment on PCB-Compatible Millimeter-Wave Reflective Unit Cells

J.-S. Ma†, G.-Y. Park†, G. Lee, H.-W. Lee, J.-W. Yu*, and D. K. Yoon*

Adv. Mater. Technol. · 2026

First authorPaper ↗

J21

Exploded view of the transparent ITO patch antenna with a printed LC layer

Reconfigurable Optically-Transparent Antenna Using Drop-on-Demand Printed Nematic Liquid Crystals

B. C. Mee, W. Kamal, J. Ma, S. J. Elston, A. A. Castrejón-Pita, W. Whittow, S. M. Morris, and J. P. Coon

Adv. Mater. Sci. Eng., 3279833 · 2026

Paper ↗

J20

Protrusion-patterned LC cell and simulated POM textures and retardation map

A Numerical Study on a Voltage-Tunable Quasi-Broadband Depolarizer Enabled by Periodic Protrusion-Induced Liquid Crystal Reorientation

J.-M. Baek, S.-G. Park, J. Ma, S. Bae, and S.-W. Oh*

Current Applied Physics, 90, 8–12 · 2026

Paper ↗

J19

Inkjet-printed CLC pixels switching between transparent and opaque states

Inkjet-Printed Cholesteric Liquid Crystal Pixels with Frequency-Addressable Optical Memory for Energy-Efficient Reflective Displays

J.-S. Ma†*, D. Lee†, H.-W. Oh, G. Ryu, J.-Y. Choi, S.-W. Oh, J.-H. Ka, A. Pradeep, J. Guo, S. Jung*, and W.-S. Kim*

ACS Appl. Mater. Interfaces, 18, 17929–17946 · 2026

First authorPaper ↗

J18

High-resolution LC pattern and topological structures written by one- and two-photon polymerization

From Millimeters to Microns: A Hybrid Strategy for Reconfigurable Liquid-Crystal Patterning

A. Pradeep*, Y. Montelongo, J.-S. Ma, Z. Xu, T. Wang, J. Qin, C. Nourshargh, M. J. Booth, S. J. Elston*, and S. M. Morris*

Small Methods, 10, e01892 · 2026

Paper ↗

J17

Schematic of the isolated high-voltage-gain DC/DC converter

Isolated High-Voltage-Gain Full-Range Soft-Switching DC/DC Converter Using Built-In Transformer and Coupled Inductors With Minimum Design Constraints

I.-B. Kong, T.-H. Seo, J. Ma, S.-O. Cha, W.-S. Kim, and S.-W. Lee

IEEE Trans. Ind. Electron., 73(7), 9899–9911 · 2026

Paper ↗

J16

2025

Exploded view of the LC-tunable bandpass filter

Tunable High-Selectivity Wideband Bandpass Filter Using Triple-Mode Stub-Loaded Resonators Based on Liquid Crystals

J.-Y. Choi, J.-S. Ma, and W.-S. Kim*

IEEE Access, 13, 186090–186102 · 2025

Paper ↗

J15

Advanced Image-Integrated Smart Windows Using Printed Electrochromic Polymer-Dispersed Liquid Crystal Droplets

J.-S. Ma, W. Kamal*, A. Pradeep, A. J. Orr, S.-W. Oh, J.-Y. Choi, J. Guo, B. Mee, H.-W. Oh, J.-H. Lee, A. A. Castrejón-Pita*, S. J. Elston*, W.-S. Kim*, and S. M. Morris*

Adv. Opt. Mater., 13, e01586 · 2025

First authorHOT TOPICPaper ↗

J14

Photo-switching of azobenzene and the push-pull mechanism

Operating temperature control in push-pull azobenzene-doped liquid crystal light-driven devices via a UV absorber

J.-S. Ma, A. Pradeep, S.-W. Oh, J.-H. Lee, J.-Y. Choi, S.-O. Cha, H.-W. Oh, and W.-S. Kim*

Dyes and Pigments, 244, 113145 · 2026

First authorPaper ↗

J13

AR glasses with GHLC pixels selectively blocking the background

High-performance switchable visor for augmented reality using low-voltage, fast-response cholesteric liquid crystals

S.-H. Lee†, S.-G. Park†, J. Ma, W.-S. Kim, and S.-W. Oh*

Dyes and Pigments, 243, 113068 · 2025

Paper ↗

J12

Virtual amusement-park environment used in the VR experiment

Off-Center Rotational Dynamics in Virtual Reality: Effects on Cybersickness and Presence

S.-O. Cha, J.-H. Ka, I.-B. Kong, J. Ma, S. Park, and W.-S. Kim*

IEEE Access, 13, 109473–109483 · 2025

Paper ↗

J11

Locked-in topological domains in a pi-cell imaged under crossed polarizers

Locking Metastable Topological Domains in Nematic Liquid Crystal Pi Cells

A. Pradeep*, U. Mur, J. Ma, N. Spiller, Y. Jin, W. Kamal, S. J. Elston*, and S. M. Morris*

Adv. Funct. Mater., 35, e12550 · 2025

Editor’s ChoicePaper ↗

J10

Fabricated LC-tunable SIR bandpass filter

Reconfigurable Wideband Bandpass Filter Using Stepped Impedance Resonator Based on Liquid Crystals

J.-Y. Choi, J. Ma, and W.-S. Kim*

Electronics, 14, 2325 · 2025

Editor’s ChoicePaper ↗

Single-lens optical system geometry for defocus blur

Blur image representation in defocus using generalized Gaussian kernel

S. Park, J. Ma, S.-W. Oh, and W.-S. Kim

J. Inf. Disp., 26(3), 321–328 · 2025

Paper ↗

2024

Fabricated LC-tunable open-loop bandpass filter

Reconfigurable narrow-band bandpass filter using electrically-coupled open-loop resonators based on liquid crystals

J.-Y. Choi, J.-S. Ma, H. Oh, and W.-S. Kim*

J. Phys. D: Appl. Phys., 57, 465307 · 2024

Paper ↗

2023

Director distribution and tilt/twist angles in the HAN polarization rotator versus viewing angle

Advanced Light: Liquid Crystals-Based Ultra-Broadband Polarization Rotator for Functional Smart Devices

J.-H. Lee, J.-S. Ma, C.-H. An, G.-H. Lee, and S.-W. Oh*

Small Methods, 8, 2301106 · 2024

Paper ↗

Advanced Materials cover art: LC-based reconfigurable satellite and 6G links

Liquid crystals for advanced smart devices with microwave and millimeter-wave applications

J. Ma, J.-Y. Choi, et al.

Adv. Mater. · 2023

First authorFrontispiece CoverPaper ↗

Layer stack of the LC-based SIW phase shifter with inserted inductive posts

Phase Shifting Enhancement of a Substrate-Integrated Waveguide Phase Shifter Based on Liquid Crystal

H.-J. Shin†, J.-S. Ma†, J.-Y. Choi†, and W.-S. Kim*

Appl. Sci., 13, 2504 · 2023

Paper ↗

2022

HTAB structure, vertical alignment principle and cell fabrication

An Evaluation of Surface-Active Agent Hexadecyltrimethylammonium Bromide with Vertical Self-Alignment Properties to Align Liquid Crystals for Various Cell Gap Conditions

J.-S. Ma, J.-Y. Choi, H.-J. Shin, J.-H. Lee, S.-W. Oh*, and W.-S. Kim*

Appl. Sci., 12, 12582 · 2022

First authorPaper ↗

2021

Floating-electrode-free coplanar waveguide phase shifter with an additional LC layer

Liquid-Crystal-Based Floating-Electrode-Free Coplanar Waveguide Phase Shifter with an Additional Liquid-Crystal Layer for 28-GHz Applications

J.-S. Ma, J.-Y. Choi, S.-W. Oh, and W.-S. Kim*

J. Phys. D: Appl. Phys., 55, 095106 · 2022

First authorPaper ↗

High-frequency properties of liquid crystals and trends in RF application technologies (in Korean)

J. Ma, J.-Y. Choi, and W.-S. Kim

Information Display · 2021

First authorPaper ↗

Patents 1

2026

Liquid Crystal Device Including Chiral Dopant and Manufacturing Method Thereof

J.-S. Ma and D. K. Yoon

Korean Patent Application No. 10-2026-0083417, filed Mar. 20, 2026 · 2026

First authorPatent Application

International Conferences 8

2026

Electrically Addressable Subpixel-Free Color Generation in Liquid-Crystal Heterostructures for Programmable Electromagnetic Surfaces

J.-S. Ma and D. K. Yoon

IMID · 2026

First authorPoster P2-198

2024

Analysis of Meander Delay Line Liquid Crystal Phase Shifter using Director Angle Extraction

H. Oh, et al.

IMID · 2024

Characterization of Nematic Liquid Crystals at 10 GHz using an Open Stub Resonator

J.-Y. Choi, J. Ma, et al.

AP-S/URSI · 2024

Paper ↗

2022

Reconfigurable Phased Array Antenna Based on Liquid Crystal with Miniaturized Bandpass Filter

J.-Y. Choi, J. Ma, et al.

ISAP · 2022

Paper ↗

Phase Shift Enhancement of Substrate Integrated Waveguide Phase Shifter Using Liquid Crystal

H. Shin, et al.

IMID · 2022

Comparative Analysis of Liquid-Crystal Driving in Liquid-Crystal Phase Shifters

J. Ma, J.-Y. Choi, et al.

AP-S/URSI · 2022

First authorPaper ↗

2021

Analysis about Novel Design of Liquid Crystal Based Floating Electrode Free Coplanar Waveguide Phase Shifter

J. Ma, et al.

IMID · 2021

First author

2020

Concept and Numerical Modeling for Virtual Acceleration Sense on Vestibular Organ using Focused Ultrasound

S. Cha, J. Ma, et al.

IMID · 2020

Domestic Conferences 4

2026

Liquid Crystal Printing as a Spatially Programmable Platform for Decoupled Optical Functionality

J. Ma, et al.

KMID (The Korean Meeting on Information Display) · 2026

First author

2024

Enhancing Light-driven Polymer Stabilized Liquid Crystal Smart Devices

J. Ma, et al.

BLCS (British Liquid Crystal Society) · 2024

First authorPDF ↗

Characterization of Nematic Liquid Crystal at 10 GHz using Director Angle Extraction

J.-Y. Choi, J. Ma, et al.

Korea Liquid Crystal Conference · 2024

2023

Compact liquid-crystal-based tunable wideband bandstop filter using electrically coupled open stubs (in Korean)

J.-Y. Choi, J. Ma, et al.

IEIE Summer Conference · 2023

Dissertations 2

2025

Development of Multifunctional Reconfigurable Liquid Crystal Devices Using Drop-on-Demand Printing

J. Ma

Ph.D. Dissertation, Dept. of Electrical Engineering, POSTECH, Korea · 2025

First author

2021

A Study of Liquid Crystal-based Phase Shifter in the Millimeter-wave Range for Utilizing Current Mass-production Technology of Display Industry

J. Ma

M.S. Thesis, Dept. of Electrical Engineering, POSTECH, Korea · 2021

First author