Session Index

Optical Design

Optical Design V
Saturday, Dec. 4, 2021  09:00-10:30
Presider: Prof. Hsiao-Yi Lee Prof. Cheng-Mu Tsai
Room: 302e
09:00 - 09:30
Manuscript ID.  0728
Paper No.  2021-SAT-S0505-I001
Invited Speaker:
Ozan Cakmakci
Recent advances in flat and curved lightguides
Ozan Cakmakci

09:30 - 09:45
Manuscript ID.  0219
Paper No.  2021-SAT-S0505-O001
Pei-Ru Chen Achromatic polarisation rotator tuned by electric field
Pei-Ru Chen;Duan-Yi Guo;Li-Min Chang;Tsung-Hsien Lin

We demonstrate an achromatic, tunable polarization rotator (PR). By applying an electric field to control the liquid crystal, it continuously rotates up to 90° in an adiabatic and nondispersive manner. This mechanism can be used for single-path ultrawideband with complex vector fields in polarized light.

09:45 - 10:00
Manuscript ID.  0243
Paper No.  2021-SAT-S0505-O002
Pin Han Slit diffraction spectrum manipulation in non-paraxial regions via the spatial-spectral correspondence relationship
Che-Yi Lin;Yen-Zhen Qiu;Hsun-Ching Hsu;Pin Han

In the past, a two-dimensional aperture diffraction of light in the non-paraxial region could only be studied using the Huygens integral without functional forms. This work presents a special case—a one dimension slit where the functional form can be obtained. Three interesting spectral effects are described: spectral switches, multi-level data transmission, and optical wavelength ruler.

10:00 - 10:15
Manuscript ID.  0110
Paper No.  2021-SAT-S0505-O003
Wei-Chih Lin Measurement of Guitar Timbre Using Laser Displacement Sensor with Nanometer Precision
Wei-Chih Lin;Tsung-Yu Hsieh;Kuan-Cheng Su;Chii-Chang Chen

In this work, we study the timbres of Apoyando and Tirando for the classical guitars, which excite mainly the strings perpendicularly and parallel to the soundboard, respectively, by using laser displacement sensor. The natural frequency of the guitar body and the pitch of the strings with overtones can be observed in the spectra. The results show that the low-pitch natural frequency and the high-pitch overtones are stronger when the strings are plucked by Apoyando and Tirando, respectively inducing the different timbres. With this effect, the guitarists can deliver the warm or joyful feeling during the performance.

  Preview abstract
10:15 - 10:30
Manuscript ID.  0573
Paper No.  2021-SAT-S0505-O004
Yi-Chun Wu Stability analysis of the MEMS scanner with optical coherence tomography imaging technology
Yi-Chun Wu;Ming-An Chen;Ting-Hao Chen;Ting-Yen Tsai;Chuan-Bor Chueh;Hsiang-Chieh Lee

Recently, MEMS scanners driven by the electrostatic actuation mechanism are increasingly being used in optical coherence tomography applications because of the low operating power, fabrication friendliness, fast response and lowest power consumption. However, most MEMS scanners driven by electrostatic actuation commercially available nowadays encounter scanning stability issues because of the open-loop driving mode. In this study, we have developed a swept-source OCT(SS-OCT) system to investigate the scanning stability of two different MEMS scanners which was operated in open-loop and close-loop driving mode individually. Repetitive cross-sectional OCT images of the fixed pattern target were acquired with a different scanning speed.