Welcome to LEAL

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  Laser Engineering & Applications Laboratory (LEAL), led by Dr Yoonchan Jeong, explores the outer reaches of photonics science and technology, especially, in high-power and high-energy regimes. The research foci are on developing innovative lasers and photonic systems and also on providing novel and powerful solutions to the related applications. The main research interests include Generation of High-Power / High-Energy Photons, Photon-Photon / Photon-Electron / Photon-Phonon Energy Conversions, Photon-Molecule Interactions, and related many interesting applications, such as Lidar, Laser Sonar, Remote Sensing, Space Optical Communication, Display, Nano-Biomedical applications, Technology Textiles, etc.

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News

  • K. Park and J. Na won 'Best Poster Award' and 'Best Paper Award' at 2018 ICAIT held in Royal Institute of Technology, Sweden. ORC director, Sir David payne who developed EDFA awarded the prizes.

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  • Article "Intermittent Burst of a Super Rouge Wave in the Breathing Multi-Soliton Regime of an Anomalous Fiber Ring Cavity" written by Seungjong Lee and Yoonchan Jeong is featured on "Advances in Engineering".

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  • K. Park won the 'Best Poster Award' at COOC 2018 in Daegu with title "Brillouin scattering induced transparency and slow-light effect in As2Se3".

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  • To commemorate the first International Day of Light, optical seminar was held under the auspices of the OSA Student chapter at Seoul National University on May 16, 2018.

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  • The "2018 Teacher's Day" celebration for our professor Y. Jeong was held on May 15th.

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  • Our student Jinseob Kim recieved the "International Day of Light" award as a representative of Korea.

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  • Our lab has signed a contract MoU (Memorandum of Understanding) with Prof. Peter Vasil'ev at the Photonics Group of Cambridge University.

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  • Article "Spatio-Temporal Analysis on Shot-to- Shot Coherence and Wave-Packet Formation in Quasi-Mode Locked Regimes in Anomalous Dispersion Fiber Ring Cavity" written by Seungjong Lee and Yoonchan Jeong is featured on "Advances in Engineering".

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  • Professor Jeong received the best lecturer award for Fall 2017. Lecture Award.png   

  • Our lab got new student Minsu Yeo, Hyukjin Yang, Hyungu Kang.

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  • LEAL awards ceremony was held on Feb. 18.

  • Research professor Luis Alonso Vazquez-Zuniga got a new job at Calmar Laser and received a certification of apreaciation from Y. Jeong.

  • Our student S. Lee received the best student paper award for COOC 2016 conference.

  • Professor Jeong received the best lecturer award for Spring 2015.

  • Our student Y. Kwon received the best student paper award for COOC 2014 conference.

  • "Adaptive broadband continuum source at 1200-1400nm based on an all-fiber dual-wavelength master- oscillator power amplifier and a high-birefringence fiber" is posted to the OCT news article.

  • "Adaptive broadband continuum source at 1200-1400nm based on an all-fiber dual-wavelength master- oscillator power amplifier and a high-birefringence fiber" is also selected as the paper of the Virtual Journal of Biomedical Optics.

  • Our student K.Park received the best student paper award for ALTA 2013 conference.



Theoretical and Numerical Study of Cylindrical-vector-mode Radiation Characteristics in Periodic Metallic Annular Slits and Their Applications


H. Kim and Y. Jeong.

vol 2, no. 5, pp. 482-487, 2018, Current Optics and Photonics

 

 Abstract : We investigate the radiation characteristics of radially polarized light and azimuthally polarized light through plasmonic subwavelength-scale annular slit (PSAS) structures, by means of both theoretical and numerical methods. Effective-medium theory was utilized to analyze the characteristics of PSAS structures, and the corresponding results showed that PSAS structures can function as a metallic medium for azimuthally polarized light, or as a low-loss dielectric medium for radially polarized light. Numerical calculations based on the finite-element method were also performed, to verify the theoretical analyses. It turned out that the numerical results supported the theoretical results. Moreover, we exploited the PSAS structures in novel nanophotonic elements with dual functionalities that could selectively focus or pass/block incident light, depending on its polarization state. For example, if PSAS structures were implemented in the dielectric region of a metallic Fresnel zone plate, the modified zone plate could function as a blocking element to azimuthally polarized light, yet as a focusing element to radially polarized light. On the contrary, if PSAS structures were implemented in the metallic region of a metallic Fresnel zone plate (i.e. the inverted form of the former), it could function as a focusing element to azimuthally polarized light, yet as a simple transparent element to radially polarized light.

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