New Physics: Sae Mulli

Aims and Scope

The origin of New Physics: Sae Mulli (NPSM, ISO abbreviation: New Phys.: Sae Mulli.): Sae Mulli (새물리 in Korean characters means ‘new physics’) is the oldest Korean pure scientific journal. It was first published in 1961 just after the Korean War by the Korean Physical Society (KPS). The primary mission of Sae Mulli was to start building up Korean physics research community from almost nothing and in fact Sae Mulli had made tremendous contributions to the Korean science community. Through a peer-review system, Sae Mulli had continued elevating the level of scientific researches, consequently becoming a cornerstone of the economic miracle of Korea...

Editor-in-Chief : Sam Jin KIM
New Physics: Sae Mulli Editorial Board

pISSN : 0374-4914
eISSN : 2289-0041

Tel : +82-2-556-4737
Fax : +82-2-554-1643
E-mail: npsm@npsm-kps.org

Research Papers

Asymmetric Planar Lightwave Circuit Michelson Interferometer for Quantum Cryptography

Seung Chan KWAK*^1,2, Hyung Myung MOON^1,2, Kiegon IM†², Jin Bong KIM^1,3, Jung-Sik CHO⁴

¹ PPI Inc., Gwangju 61008, Korea

² Department of Physics, Chonnam National University, Gwangju 61186, Korea

³ School of Chemical Engineering, Chonnam National University, Gwangju 61186, Korea

⁴ SK Telecom, Seongnam 13595, Korea

We have designed and fabricated a planar lightwave circuit (PLC) Michelson interferometer device with a long delay path length for quantum cryptography. Faraday rotator mirrors were employed to improve the birefringence polarization effect in the asymmetric planar lightwave circuit, and a phase-modulated quantum cryptography system was constructed on the basis of the time-division interference scheme. The path difference in the present Michelson interferometer is 40.6 cm within a 0.2 mm error, and the excess loss is 1.56 dB. A quantum error rate of 2% was obtained from the quantum cryptography system utilizing the present asymmetric planar lightwave circuit interferometer.

New Phys.: Sae Mulli 2018; 68: 795-800

Effects of Nanogaps on the Whispering Gallery Modes in a Microring Resonator

Jinwoo HAN*

Department of Physics, Daegu University, Gyungsan 38453, Korea

In this work, we designed a two-dimensional (2D) microring resonator (Q ~ 8 $\times$10$^5$) and numerically studied the effects of a nanogap on the whispering gallery modes (WGMs). For this purpose, the finite element method with COMSOL multiphysics software was employed. Perturbations of the WGM resonances, which depend on the size and the angle of the nanogap, can be characterized by using the shift, Q value, and splitting of the resonance peaks. For studying the size dependence, we varied the thickness of the horizontal gap from 0 to 140 nm. The resonance wavelengths were increasingly blue-shifted with increasing thickness. The angle dependence showed that the whispering gallery modes were perturbed more strongly by an oblique gap than by either a horizontal or a vertical gap. These results indicate that oblique defects inside a resonator have more critical effects on a high-Q microring resonator than horizontal or vertical ones.

New Phys.: Sae Mulli 2018; 68: 775-780

New Phys.: Sae Mulli 2018; 68: 707~818

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Review Paper

Gravitational Waves and Tidal Deformability of Neutron Stars

Young-Min KIM, Kyujin KWAK, Yeunhwan LIM, Chang Ho HYUN, Chang-Hwan LEE*

New Phys.: Sae Mulli 2018; 68: 707-717 https://doi.org/10.3938/NPSM.68.707