Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Hong Joo Song"'
Highly luminescent near-infrared Cu-doped InP quantum dots with a Zn–Cu–In–S/ZnS double shell scheme
Autor:
Hong-Joo Song, Hannes Zschiesche, Bum-Joo Lee, Suk-Young Yoon, Jung-Ho Jo, Jong-Shik Jang, Heesun Yang, Chul-Jong Han, Armin Wedel, Kim Jiyong, Hyung Seok Choi, Kyoungwon Park, Hyun-Min Kim, Yi Jeongmin
Publikováno v:
Journal of Materials Chemistry C. 9:4330-4337
Upon Cu doping into host semiconductor quantum dots (QDs), intra-gap states inside the band gap are generated, by which energy down-shifted photoluminescence (PL) with broad emissivity and large Stokes shift emerges. Technologically important, enviro
Autor:
Nam Chol Song, Jeongno Lee, Chul Jong Han, Hong Joo Song, Jung Ho Park, Yong Hyun Lee, Kyoungwon Park
Publikováno v:
Current Applied Physics. 20:1136-1144
This report discusses the effect of speckle size on the quality of holographic images based on a liquid-crystal-on-silicon (LCoS) spatial light modulator (SLM). Further, it proposes methods of quantifying the average speckle size and holographic imag
Autor:
Dong-Wook Jang, Dae-Han Kwon, Kim Woong-Rae, Hee-Woong Song, Keun-Soo Song, Hae-Kang Jung, Hong-Joo Song, Joo-Hwan Cho, Jonghoon Oh, Kyung-hoon Kim
Publikováno v:
2017 Symposium on VLSI Circuits.
This paper presents a novel floating tap termination (FTT) scheme with inverted data bus inversion (iDBI_AC) and floating tap forcing (FTF) to remove the DC current path, leading to reduction of static current. The iDBI_AC and FTF are proposed to res
Publikováno v:
Components and Packaging for Laser Systems II.
An front facet anti-reflection coated solitary laser diode is operated in the external cavity diode laser (ECDL). For wavelength stabilization and narrow spectral width, the diffraction grating is used in a Littrow configuration. At an injection curr
Autor:
Hong Joo Song, Jung Ho Park, Cheol Koo Hahn, Cheong Hyun Roh, Jun Ho Lee, Hong Goo Choi, Min-Woo Ha
Publikováno v:
Applied Surface Science. 257:8102-8105
In this paper, we report the dependence of Ni/Ag/diffusion barrier (D.B)/Au p -ohmic contact on Pt D.B and Ti D.B for GaN based flip-chip light emitting diodes (FC LEDs). It is shown that D.B metals have strongly influenced on the reflectance and con
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 59:375-382
This paper proposes an oppositely coupled varactor pair and reports the measured results for applying to a test digitally controlled oscillator (DCO). The pair exploits the differences between the accumulation region capacitance and inversion region
Autor:
Hee-Dong Kim, Dong Ho Kim, Tae Geun Kim, Cheong Hyun Roh, Hong Joo Song, Noriaki Tsurumachi, Cheol Koo Hahn
Publikováno v:
Journal of the Korean Physical Society. 55:1215-1218
We investigated the changes in the dark currents in InAs quantum-dot (QD) avalanche photodiodes (APDs) with different shapes of mesas. The APDs were fabricated by using inductively coupled plasma/reactive ion etching (ICP/RIE) or H3PO4 chemical etchi
Autor:
Hyo Derk Park, Hong Joo Song, Pyong Choi, Young Chang Jo, Hoon Kim, Young-Se Kwon, Yeon Shik Choi
Publikováno v:
Japanese Journal of Applied Physics. 46:6222-6226
In this study, a InGaAs/InP passive unit pixel with an optical-sensitivity-improved heterojunction phototransistor (HPT) for array imaging applications has been designed and characterized for low-light signal detection considering light-dependent shu
Publikováno v:
Japanese Journal of Applied Physics. 46:2389-2394
An InGaAs/InP heterojunction phototransistor (HPT) 1×128 one dimensional array chip with an improved optical sensitivity and shunt resistance has been designed and characterized for the detection of a low light signal intensity. We also present epit
Publikováno v:
High-Power Diode Laser Technology and Applications XIII.
An front facet-low reflection coated broad-area laser(BAL) diode with an emitter size of 50 μm x 1 μm and a chip length of 2000 μm is operated in the external cavity diode laser(ECDL). For wavelength stabilization and narrow spectral width, the di