His scientific interests lie mostly in Optoelectronics, Optics, Photonic crystal, Lasing threshold and Laser. His Optoelectronics study typically links adjacent topics like Quantum well. The study incorporates disciplines such as Layer and Active layer in addition to Optics.
His research integrates issues of Spontaneous emission, Whispering-gallery wave, Resonator and Semiconductor laser theory in his study of Photonic crystal. His Semiconductor laser theory research is multidisciplinary, relying on both Photonics and Yablonovite. His work investigates the relationship between Diode and topics such as Light-emitting diode that intersect with problems in Quantum efficiency, Carrier generation and recombination and Auger effect.
The scientist’s investigation covers issues in Optoelectronics, Optics, Diode, Laser and Light-emitting diode. His Optoelectronics research integrates issues from Quantum well and Spontaneous emission. The various areas that Han-Youl Ryu examines in his Optics study include Semiconductor and Active layer.
In general Diode study, his work on Blue laser often relates to the realm of Voltage droop, thereby connecting several areas of interest. His research in the fields of Optical pumping and Laser power scaling overlaps with other disciplines such as Normal mode and Annealing. His studies examine the connections between Photonic crystal and genetics, as well as such issues in Lasing threshold, with regards to Polarization.
Han-Youl Ryu mainly investigates Optoelectronics, Diode, Light-emitting diode, Quantum efficiency and Quantum well. His Optoelectronics study integrates concerns from other disciplines, such as Laser and Voltage. His Diode research includes themes of Sapphire, Auger effect, Doping and Optics.
His study in the field of Ultraviolet and Photonic crystal is also linked to topics like Index method. His Light-emitting diode study combines topics from a wide range of disciplines, such as Spontaneous emission, Finite-difference time-domain method and Chip. His studies deal with areas such as Green-light, White light and Energy conversion efficiency as well as Quantum efficiency.
Han-Youl Ryu spends much of his time researching Diode, Optoelectronics, Light-emitting diode, Quantum efficiency and Voltage droop. Han-Youl Ryu has included themes like Quantum well, Nanorod, Optics and Voltage in his Diode study. His study in Quantum well is interdisciplinary in nature, drawing from both Auger effect and Electric field.
Han-Youl Ryu has researched Optics in several fields, including Magazine, Chemical substance and Semiconductor. His work deals with themes such as Spontaneous emission, White light, Phosphor and Energy conversion efficiency, which intersect with Quantum efficiency. His Spontaneous emission study combines topics in areas such as Electrical conductor and Flip chip.
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Waveguides, resonators and their coupled elements in photonic crystal slabs.
M. Notomi;A. Shinya;S. Mitsugi;E. Kuramochi.
Optics Express (2004)
Rate equation analysis of efficiency droop in InGaN light-emitting diodes
Han-Youl Ryu;Hyun-Sung Kim;Jong-In Shim.
Applied Physics Letters (2009)
Very low threshold photonic band edge lasers from free-standing triangular photonic crystal slabs
Han-Youl Ryu;Soon-Hong Kwon;Yong-Jae Lee;Yong-Hee Lee.
conference on lasers and electro optics (2002)
Semiconductor optoelectronic device and method of fabricating the same
Ho-Sun Paek;Seidan Ri;Han-Youl Ryu;Tan Sakong.
High-quality-factor and small-mode-volume hexapole modes in photonic-crystal-slab nanocavities
Han-Youl Ryu;Masaya Notomi;Yong-Hee Lee.
Applied Physics Letters (2003)
Characteristics of modified single-defect two-dimensional photonic crystal lasers
Hong-Gyu Park;Jeong-Ki Hwang;Joon Huh;Han-Youl Ryu.
IEEE Journal of Quantum Electronics (2002)
Square-lattice photonic band-gap single-cell laser operating in the lowest-order whispering gallery mode
Han Youl Ryu;Se Heon Kim;Hong Gyu Park;Jeong Ki Hwang.
Applied Physics Letters (2002)
Investigation of Light Extraction Efficiency in AlGaN Deep-Ultraviolet Light-Emitting Diodes
Han-Youl Ryu;Il-Gyun Choi;Hyo-Sik Choi;Jong-In Shim.
Applied Physics Express (2013)
Room-temperature triangular-lattice two-dimensional photonic band gap lasers operating at 1.54 μm
Jeong Ki Hwang;Han Youl Ryu;Dae Sung Song;Il Young Han.
Applied Physics Letters (2000)
Nondegenerate monopole-mode two-dimensional photonic band gap laser
Hong Gyu Park;Jeong Ki Hwang;Joon Huh;Han Youl Ryu.
Applied Physics Letters (2001)
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