JAEYEON PYO

3D Printed Photonics

We study light-matter interactions using 3D printing methods.

Our vision is to explore material issues related to the entire journey of light, encompassing generation, transmission, and detection. Specifically, we are studying the behavior of light in novel systems implemented through 3D printing methods. Also, we are developing 3D printing processes as a manufacturing method for advanced photonic devices, including displays, lighting, optical fibers, sensors, and cameras, across nano, micro, and macro scales.

Member affairs

강하민, 학부인턴 수료를 축하합니다. (2025.07.)

김동규, UST인턴 수료를 축하합니다. (2025.02.)

Abdullah, 석박사 통합과정 진학을 환영합니다. (2024.09.)

유찬빈, 박사과정 진학을 환영합니다. (2024.03.)

유찬빈, 석사학위 수여를 축하합니다. (2024.02.)

김민호, 학부인턴 수료를 축하합니다. (2023.08.)

유찬빈, 석사과정 진학을 환영합니다. (2022.03.)

배종천, 박사과정 진학을 환영합니다. (2021.09.)

배종천, 석사학위 수여를 축하합니다. (2021.08.)

서상우, 학부인턴 수료를 축하합니다. (2021.02.)

최성혁, 학부인턴 수료를 축하합니다. (2020.08.)

김성현, 석사과정 진학을 환영합니다. (2020.03.)

강동재, 학부인턴 수료를 축하합니다. (2020.02.)

유찬빈, 학부인턴 수료를 축하합니다. (2020.02.)

김성현, 학부인턴 수료를 축하합니다. (2019.09.)

배종천, 석사과정 진학을 환영합니다. (2019.09.)

정희철, 학부인턴 수료를 축하합니다. (2019.06.)

배종천, 학부인턴 수료를 축하합니다. (2019.06.)

Research news

유찬빈, UST 국제학회 지원사업 선정 (EOSAM) (2025.03.)

배종천, KFPE 2025 Spring, 우수구두발표상 수상 (2025.03.)

표재연, KERI 신진연구자 우수논문상 수상 (2025.01.)

유찬빈, KFPE 2024 Fall, 우수포스터상 수상 (2024.10.)

유찬빈, UST Conference, 구두발표 장려상 수상 (2024.09.)

표재연, 이달의 KERI인상 수상 (2024.07.)

유찬빈, UST-KERI Conference, Best Oral Presenter 수상 (2024.07.)

배종천, UST-KERI Conference, Best Oral Presenter (학연과정 부문) 수상 (2024.07.)

ACS Nano [IF=15.8] Accepted (2024.07.)

ACS Nano [IF=15.8] Accepted (2024.05.)

Adv. Mater. Technol. [IF=6.4] Accepted (2024.04.)

한국광학회 소식지 K-Light 소개 (2023.10.)

유찬빈, UST-KERI Conference, Best Poster Award 수상 (2023.08.)

ACS Nano [IF=15.8] Accepted (2023.06.)

김성현, GCIM 2023, Outstanding Poster Award 수상 (2023.06.)

배종천, KFPE 2021, Poster Award 수상 (2021.10.)

Nano Letters [IF=9.6] Accepted (2021.06.)

Adv. Eng. Mater. [IF=3.4] Accepted (2021.05.)

표재연, 국가과학기술연구회(NST) 이사장상 수상 (2020.08.)

표재연, 이달의 KERI인상 수상 (2020.08.)

미국광학회(OSA) 소식지 OPN 소개 (2020.08.)

ACS Nano [IF=15.8] Accepted (2020.07.)

Visualization of Microcapillary Tips Using Waveguided Light

This study introduces a novel technique for identifying contact of glass microcapillaries using light. A significant challenge in using glass microcapillaries is the risk of tip breakage due to excessive contact. Typically, delicate contact is achieved by observing through an optical microscope. However, due to the diffraction limit of light, precisely determining contact in nanometer-scale glass microcapillaries is challenging. In this study, we developed a new method for visualizing and identifying contact of the tip of glass microcapillaries using light. Specifically, when light is incident on the backside of the glass microcapillary, it propagates along the wall and scatters at the sharp tip. This approach enables clear visualization of the tip even in the nanometer-scale, surpassing the diffraction limit of light. Notably, when the tip contacts an object, the scattered light disappears distinctly, allowing clear differentiation between contact and non-contact states based on the presence or absence of tip-scattered light. The change of tip scattering upon contact arises from the near-field interaction of light, where the evanescent wave responsible for tip scattering is transmitted to the adjacent medium upon contact. Its practical utility was demonstrated by identifying delicate contact in nanoscale 3D printing, establishing nanoscale localized copper electrodeposition, preventing nozzle clogging during the electrodeposition, and determining delicate contact with oral epithelial cells, showcasing its accurate and immediate performance.

ACS Nano 18, 21544 (2024)

Directional Emission from 3D-printed Nanowires

Light-emitting materials are widely used in displays, optical communications, photonic integrated circuits, sensors, and optical storage. Reducing the size of unit cells made of light-emitting materials generally improves device performance. For instance, decreasing the size of light-emitting pixels in display devices enhances resolution within the same area. Consequently, there is a continuous need to fabricate light-emitting materials at nanoscale dimensions. When the size of these materials is reduced to the scale of hundreds of nanometers, unique interactions between light and matter occur. This is because the wavelength of electromagnetic waves in visible light is on the order of hundreds of nanometers. As a result, emission patterns observed in nanostructures differ significantly from those observed in macro structures. Therefore, understanding these unique emission patterns is essential for the practical application of nanoscale photonic materials. In this study, we observed and analyzed the emission patterns of nano- to micrometer-scale structures by reliably fabricating light-emitting materials at desired dimensions using a 3D printing method. Notable directionality was observed in nanostructures with a diameter of approximately 300 nm, which was analyzed in depth using FDTD simulations. Additionally, we experimentally demonstrated that the highly directional emission patterns can play a crucial role in preventing optical crosstalk.

ACS Nano 18, 16265 (2024)

All-printed Electrically Driven Lighting

Light emitting devices are typically manufactured as a sandwiched structure with a transparent electrode on top, which limits their adoption in a complex form-factor. Here, all-printed electrically driven lighting is demonstrated using the direct ink writing method. The electrochemiluminescence(ECL) emitting layer and electrodes are directly printed in a side-by-side electrode configuration. A 3D printable ECL ink is developed by incorporating silica nanoparticles as rheological modifiers to realize well-defined patterns with high structural integrity. Graphene-covered Ag electrodes embrace both the electrical conductivity and electrochemical stability for efficient ECL operation. This approach allows for intricate designs such as combs and spirals, and seamless manufacturing on diverse substrates including flexible films.

Advanced Materials Technologies 9, 2302190 (2024)

3D Printing of Structural Color

Light is diffracted when it meets small microstructures (around 1/1000 the thickness of a hair) at the wavelength level. Among the beautiful colors observed in nature, the wings of butterflies, the shells of beetles, and the feathers of peacocks are structural colors that are manifested by microstructures, not pigments. With the development of nano-processing technology, it has become possible to artificially implement structural colors, but 3D printing technology has had difficulty in implementing small microstructures that can diffract light. In this study, we showed that it is possible to implement and control structural colors by fabricating 3D diffraction gratings based on nano 3D printing technology. 3D printing method has the advantage of being less constrained than conventional nano-processing, so it can be applied to a variety of materials or forms of substrates at room temperature and atmospheric pressure. Structural colors by diffraction gratings can be utilized in transparent display technologies such as HUD in cars, smart windows/mirrors, and advanced display technologies such as AR, and diffraction gratings themselves can be used in various optical physics research.

ACS Nano 17, 13584 (2023)

Nanoscale Patterning of Quantum Dots on Paper

Nanoscale integration is difficult on rough surfaces despite their ubiquity and usefulness. Paper is an emerging material system because it is renewable, flexible, and lightweight. However, owing to the rough surface of paper, it is difficult to use conventional nanoscale integration methods. Herein, nanoscale printing of CdSe/ZnS quantum dots on paper using a 3D printing method with surface adaptive control of the femtoliter meniscus is demonstrated. The approach allows the direct integration of light-emitting materials on the intact surface of paper with nanoscale lateral confinement. The 3D-printed nanostructures can be treated as a planar pattern of the nanoscale dots when viewed from the top. The individually addressable nature of the 3D printing method enables the equalization of the printed heights, which is essential for practical use in general planar systems. This method can be used in many areas that require paper such as paper electronics, security printing, biomedical engineering, and possibly other material systems with rough surfaces.

Advanced Engineering Materials 23, 2100339 (2021)

Nanoscale 3D Display Pixels

The pixel is the minimum unit used to represent or record information in photonic devices. The size of the pixel determines the density of the integrated information, such as the resolution of displays or cameras. Most methods used to produce display pixels are based on two-dimensional patterning of light-emitting materials. However, the brightness of the pixels is limited when they are miniaturized to nanoscale dimensions owing to their limited volume. Herein, we demonstrate the production of three-dimensional (3D) pixels with nanoscale dimensions based on the 3D printing of quantum dots embedded in polymer nanowires. In particular, a femtoliter meniscus was used to guide the solidification of liquid inks to form vertically freestanding nanopillar structures. Based on the 3D layout, we show high-density integration of color pixels, with a lateral dimension of 620 nm and a pitch of 3 μm for each of the red, green, and blue colors. The 3D structure enabled a 2-fold increase in brightness without significant effects on the spatial resolution of the pixels. In addition, we demonstrate individual control of the brightness based on a simple adjustment of the height of the 3D pixels. This method can be used to achieve super-high-resolution display devices and various photonic applications across a range of disciplines.

ACS Nano 14, 10993 (2020)

Nanowire Waveguides

3D integration of photonic nanowire waveguides is demonstrated by a precise and versatile meniscus-guided 3D nanoprinting method. By realizing 3D direct linking of nanophotonic elements with no substrate leakage and, moreover, excellent stretchable operations (>50%), 3D functional photonic components of multiplexers and splitters are demonstrated finally.

Advanced Optical Materials 4, 1190 (2016)

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