Prof. Jerome Kartham Hyun Profile

Prof. Jerome Kartham Hyun

at Ewha Womans Univ

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Author

Publications (3)

Proceedings Article | 10 March 2020 Presentation

Vibrant reflective structural colors with lossy metals using grating supermode resonances (Conference Presentation)

Youngji Kim, Jerome Hyun, Kyungmin Jung

Proceedings Volume 11289, 112891J (2020) https://doi.org/10.1117/12.2545425

KEYWORDS: Metals, Reflectivity, Dielectric polarization, Structural design, Silver, Aluminum, Dielectrics, Visualization, Reflection, Waveguide modes

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Proceedings Article | 10 September 2019 Presentation

Colorimetric humidity sensors with sub-50ms response times using randomly arranged titania microspheres (Conference Presentation)

Syazwani Mohd Noor, Hansol Jang, Kyungnae Baek, Yi-Rong Pei, Al-Mahmnur Alam, Jin-Ho Choy, Jerome Hyun

Proceedings Volume 11089, 110891D (2019) https://doi.org/10.1117/12.2528696

KEYWORDS: Humidity, Sensors, Scattering, Particles, Ultrafast phenomena, Photonics systems, Titanium dioxide

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Disordered photonic systems as observed in iridescent insects and flowers introduces new pathways for realizing cost-effective and scalable structural colors. In this work, we present a fast-colorimetric humidity sensor derived from a disordered arrangement of polydisperse nanoporous titania microspheres. The sensor relies on changes in the total scattering of the microspheres upon variations in the surrounding humidity. The incoherent scattering from each particle allows the sum of the individual cross sections to determine the total scattering cross section, which converts the individual noisy spectra to a smoothly varying spectrum that gives rise to a saturated color.[1] We show that because the titania microspheres is highly porous with 1~2 nm-sized nanopores, water can diffuse into the particle interior via intracrystalline dynamics, thereby changing the effective permittivity and consequently the scattered color at ultra-fast speeds (sub 50ms). Our results provide a practical route toward achieving cheap, simple, scalable, ultrafast colorimetric humidity sensors using structural colors from disordered nanoporous microspheres [2]. [1] Alam, A-M; Baek K; Son J; Pei Y-R; Kim D-H; Choy J-H; and Hyun J-K. Generating Color from Polydisperse, Near Micron-Sized TiO2 Particles, ACS Appl. Mater. Interfaces, 2017, 9 (28), 23941– 23948 [2] M-Noor, S; Jang, H ; Baek K; Pei Y-R; Alam, A-M; Kim,Y.H; Kim, I.S; Choy, J.H and Hyun J-K. Ultrafast humidity-responsive structural colors from disordered nanoporous titania microspheres. Submitted (2019)

Proceedings Article | 18 September 2018 Presentation

Semitransparent and colorful organic solar cells using Fabry-Perot optical filters as electrodes (Conference Presentation)

Youngji Kim, Jieun Son, Shafidah Shafian, Kyungkon Kim, Jerome Hyun

Proceedings Volume 10737, 107370K (2018) https://doi.org/10.1117/12.2320495

KEYWORDS: Organic photovoltaics, Optical filters, Electrodes, Solar cells, Fabry–Perot interferometers, Photovoltaics, Californium, Absorption, Visible radiation, Opacity

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