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6 results on '"D.P. Tsai"'

1. Breaking up the Anapole: or How to Separate Toroidal and Electric Dipole Excitations in Matter

Author

W.-Y. Tsail, D.P. Tsai, Nikolay I. Zheludev, and Vassili Savinov

Subjects
Physics, Dipole, Acceleration, Electromagnetics, Toroid, Physics::Plasma Physics, Electric field, Quantum electrodynamics, Spectroscopy, Electromagnetic radiation, Refractive index
Abstract

Increasing interest in electrodynamics and spectroscopy of toroidal excitations in matter has initiated a discussion on independent physical significance of toroidal and electric dipole excitations. Here we introduce three Gedanken-Experiments that reveal their fundamental differences.

Published
2018
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3. Optical magnetic response of upright plasmonic molecules in 3D metamaterial

Author

C.T. Hsiao, L. Zhou, D.P. Tsai, P.C. Wu, G.Y. Guo, W.T. Chen, Nikolay I. Zheludev, Kuang-Yu Yang, C.J. Chen, and S. Sun

Subjects
Materials science, business.industry, technology, industry, and agriculture, Physics::Optics, Metamaterial, Magnetic response, equipment and supplies, Sample (graphics), Magnetic field, Resonator, Optics, parasitic diseases, Optoelectronics, Molecule, business, human activities, Plasmon
Abstract

An array of fabricated U-shaped split-ring resonators shows a profound response to the magnetic field of light incident normal to the sample.

Published
2011
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4. High-power angled broad-area 1.3-μm laser diodes with good beam quality.

Author

Chih-Hung Tsai, Yi-Shin Su, Chia-Wei Tsai, D.P. Tsai, and Ching-Fuh Lin

Abstract

A new type of high-power laser diodes is fabricated with a broad-area waveguide tilted at 7° from the facet normal. For the current between 0.6 and 1.2 A, it behaves like a superluminescent diode with 40-nm spectral width and 40-mW output power. The far field emits at about 25° away from the facet normal. For the current above 1.2 A, it oscillates with a narrow spectrum. The far field emits along the facet normal with its angle only twice of the diffraction limit. The output power per facet could be 1 W at 12 A. [ABSTRACT FROM PUBLISHER]

Published
2004
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5. Observation of Pseudogap above T-c in 122 and 111 Iron-based Superconductors by Ultrafast Optical Spectroscopy

Author

D.P. Tsai, Ching-Wu Chu, Yu-Chieh Wen, Yu-Ruei Wu, Bing Lv, Yao-Tsung Hsieh, Maw-Kuen Wu, Kuan-Jen Wang, Ming-Jye Wang, Kung-Hsuan Lin, and Chung-Chieh Chang

Subjects
Optical pumping, Superconductivity, Materials science, Condensed matter physics, Iron based, Condensed Matter::Superconductivity, Doping, Ultrafast optics, Condensed Matter::Strongly Correlated Electrons, Pseudogap, Spectroscopy, Ultrashort pulse
Abstract

We studied optimally-doped (Ba 0.6 K 0.4 )Fe 2 As 2 and LiFeAs by using ultrafast optical spectroscopy. Our temperature-dependent experimental results revealed that pseudogap exists above superconducting state in both materials.

6. Variable Environmental Index Spectroscopy in Metamaterials

Author

W.-Y. Tsai, Nikolay I. Zheludev, Vassili Savinov, D.P. Tsai, and Jun-Yu Ou

Subjects
Electromagnetics, Materials science, business.industry, Electromagnetic response, Metamaterial, Physics::Optics, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Physics::Classical Physics, 01 natural sciences, 0104 chemical sciences, Environmental index, Reflection (physics), Optoelectronics, 0210 nano-technology, Spectroscopy, business, Refractive index, Variable (mathematics)
Abstract

By immersing metamaterial nanostructures into liquids with different refractive indices, we obtain valuable information on role of different multipoles in their electromagnetic response. Applications to detection of anapole modes are discussed.

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