Search

Your search keyword '"Park, Hyeong-Ho"' showing total 210 results
Start Over Author "Park, Hyeong-Ho"
210 results on '"Park, Hyeong-Ho"'

18. Nanosilver Colloids-Filled Photonic Crystal Arrays for Photoluminescence Enhancement

Author

Park Hyeong-Ho, Park Seong-Je, Lee Soon-Won, Jeong Sohee, Lee Ji-Hye, Choi Dae-Geun, Jeong Jun-Ho, and Choi Jun-Hyuk

Subjects
Silver nanoparticles, Photonic crystal, Localized surface plasmon resonance (LSPR), Nanoimprint, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract For the improved surface plasmon-coupled photoluminescence emission, a more accessible fabrication method of a controlled nanosilver pattern array was developed by effectively filling the predefined hole array with nanosilver colloid in a UV-curable resin via direct nanoimprinting. When applied to a glass substrate for light emittance with an oxide spacer layer on top of the nanosilver pattern, hybrid emission enhancements were produced from both the localized surface plasmon resonance-coupled emission enhancement and the guided light extraction from the photonic crystal array. When CdSe/ZnS nanocrystal quantum dots were deposited as an active emitter, a total photoluminescence intensity improvement of 84% was observed. This was attributed to contributions from both the silver nanoparticle filling and the nanoimprinted photonic crystal array.

Published
2010
Full Text
View/download PDF

29. Enhanced Light Absorption and Efficient Carrier Collection in MoS 2 Monolayers on Au Nanopillars.

Author

Song, Jungeun, Kwon, Soyeong, Jeong, Hyunjeong, Choi, Hyeji, Nguyen, Anh Thi, Park, Ha Kyung, Park, Hyeong-Ho, Jo, William, Lee, Sang Wook, and Kim, Dong-Wook

Abstract

We fabricated hybrid nanostructures consisting of MoS2 monolayers and Au nanopillar (Au-NP) arrays. The surface morphology and Raman spectra showed that the MoS2 flakes transferred onto the Au-NPs were very flat and nonstrained. The Raman and photoluminescence intensities of MoS2/Au-NP were 3- and 20-fold larger than those of MoS2 flakes on a flat Au thin film, respectively. The finite-difference time-domain calculations showed that the Au-NPs significantly concentrated the incident light near their surfaces, leading to broadband absorption enhancement in the MoS2 flakes. Compared with a flat Au thin film, the Au-NPs enabled a 6-fold increase in the absorption in the MoS2 monolayer at a wavelength of 615 nm. The contact potential difference mapping showed that the electric potential at the MoS2/Au contact region was higher than that of the suspended MoS2 region by 85 mV. Such potential modulation enabled the Au-NPs to efficiently collect photogenerated electrons from the MoS2 flakes, as revealed by the uniform positive surface photovoltage signals throughout the MoS2 surface. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

32. Enhanced optical absorption in conformally grown MoS2 layers on SiO2/Si substrates with SiO2 nanopillars with a height of 50 nm

Author

Choi, Hyeji, primary, Kim, Eunah, additional, Kwon, Soyeong, additional, Kim, Jayeong, additional, Nguyen, Anh Duc, additional, Lee, Seong-Yeon, additional, Ko, Eunji, additional, Baek, Suyeun, additional, Park, Hyeong-Ho, additional, Park, Yun Chang, additional, Yee, Ki-Ju, additional, Yoon, Seokhyun, additional, Kim, Yong Soo, additional, and Kim, Dong-Wook, additional

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results