Student Paper Award Announced!!

Session Index

Optical Design and Testing

Oral session 2 - Optical System Measurement
Thursday, Dec. 4, 2014  15:30-17:00
Chair: Ming-Tzer Lin,Chuen-Lin Tien
Room: B17
15:30 - 16:00 Paper No.  2014-Thu-S0502-I001
Invited Speaker:
Markus Chmielus
Neutron and Synchrotron Diffraction for Magnetic Shape Memory Alloy and Thin Film Applications
Markus Chmielus,

While standard x-ray diffraction (XRD) and electron diffraction are great techniques to investigate the microstructure, residual strain, phase and texture transformation in a laboratory environment, some research questions demand large scale research facilities especially neutron and synchrotron diffraction experiments. At the beginning of this talk, we will present several scenarios in which neutron diffraction enabled us to solve advanced problems in Ni-Mn-Ga magnetic shape-memory alloy (MSMA) research. The three examples given will be the investigation of the grain orientation and distribution throughout a MSMA foam, the changing martensite modulation within a MSMA single crystal ingot as well as an advanced analysis of twinning in a MSMA sample. Furthermore, we will present cases in which synchrotron diffraction has a great advantage in thin films research over standard XRD, for example in texture transformation and thin film stress analysis. Finally, we will show that the use of complementary characterization methods (small and large scale) will result in the most comprehensive understanding of materials science and engineering questions.

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16:00 - 16:15 Paper No.  2014-Thu-S0502-O006
Chia-Feng Yeh Award Candidate Design of a Near-Infrared Filter Based on Guided- Mode Resonance in a Two-Dimensional Silicon Photonic Crystal Slab
Chia-Feng Yeh,Neil Na,Erik Chen,

We study the guided-mode resonance in a silicon photonic crystal slab with background index 1.1. Using the finite-difference time-domain method, we design a near- infrared filter featuring a 3dB-bandwidth of 20 nm at normal incidence.

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16:15 - 16:30 Paper No.  2014-Thu-S0502-O007
Kuan-Heng Jaou Award Candidate Light extraction enhancement for GaN-based LED with rotation pyramid texture by using ray path analysis
Kuan-Heng Jaou,Jui-Wen Pan,Che-Wen Chiang,

Based on the different locations and rotations of the pyramid textures, we study three different gallium-nitride (GaN) based light emitting diode (LED), relationship between light extraction efficiency (LEE) and rotation angle of pyramid texture. Most of the escaped photon flux propagated in the seven escape paths were proposed in the simulation of the LEDs.

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16:30 - 16:45 Paper No.  2014-Thu-S0502-O014
Jia-Wei Chen Award Candidate Alignment Insensitive Shack-Hartmann Wavefront Sensor
Jia-Wei Chen,Tin-Qian Lin,Chao-Wen Liang,

Conventional Shack-Hartmann wavefront sensor always consists of lens array and relay optics. The relay optics would induce additional aberrations into system and increase measurement uncertainties. In this paper, the system without relay optics is constructed. Furthermore, removing the alignment error through analytical method is available because of the simpler system.

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16:45 - 17:00 Paper No.  2014-Thu-S0502-O015
Yi-Tun Kuo Award Candidate Precision Measurement of Linear Refractive Indices for Nematic Liquid Crystal Using Total Internal Reflection Method
Yi-Tun Kuo,

We have successfully used a goniometer system to measure the liquid crystal refractive indices at infrared band via the total internal reflection (TIR) technique. By fitting angular-dependent reflectance curves, the individual extraordinary (ne) and ordinary (no) refractive indices can be accurately measured.

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