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HsienHuiCheng_Dissertation(2).pdf (12.46 MB)

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HIGH EFFICIENCY DOUBLE TWIST PANCHARATNAM PHASE OPTICAL BEAM DEFLECTORS

Cheng, HsienHui
http://rave.ohiolink.edu/etdc/view?acc_num=kent1437514337

Abstract Details

2015, PHD, Kent State University, College of Arts and Sciences / Chemical Physics.
We demonstrate a camera combined with a large angle non-mechanical image steering device based on primary a Pancharatnam phase device. The device consists of primary Pancharatnam phase beam deflectors and liquid crystal polarization rotators (LCPRs). The image steering device can change the view direction of a camera to ±30° and ±10° while the image quality using this device is only slightly degraded at large angles. We explore the diffraction efficiency limit of double twist Pancharatnam phase deflectors (DTPPD) with large deflection angles. We show that a Pancharatnam phase device with a dual twist structure can deflect light up to 60 degrees with nearly perfect efficiency. This was beyond the limits previous thought for these types of devices. In this dissertation we consider the range of parameters that will allow for high efficiency and show results for a structure that demonstrates up to 80 degree deflection. We then explore the light propagation through these devices to point out interesting intensity variations in the deflected mode of light as it traverses the deflecting layer. Finally, we offer that a key to understanding the efficiency of these devices, is not the typical parameters important for traditional diffractive devices, but is the control of the polarization state of light. Liquid crystal polarization rotators (LCPRs) are another key component in digital image steering devices. To extend fast response LCPRs from switchers to display applications, we propose and demonstrate a fast response liquid crystal (LC) variable optical retarder, or attenuator with several transmission levels. The fast response LC optical device consists of dual pi-cells. The device is designed so that the transition between any two states is controlled by the application of an increased voltage level, rather than by applying a lower level. This design offers transition times in the range of 10s of microseconds between any transmission states. The combination of the high efficiency Pancharatnam phase device and the high speed polarization rotators allow for an ultra-compact, high quality, non-mechanical optical image steering system.
Philip Bos, J. (Advisor)
Hiroshi Yokoyama (Committee Member)
Lian-Chy Chien (Committee Member)
Deng-Ke Yang (Committee Member)
Achintya Bhowmik (Committee Member)
James Gleeson, T. (Committee Member)
Mark Manley (Committee Chair)
111 p.
Optics; Physics
Liquid Crystal Device, Pancharatnam Phase, Photoaligment, Polarization Grating, Fast Response Display

Recommended Citations

Citations

  • Cheng, H. (2015). HIGH EFFICIENCY DOUBLE TWIST PANCHARATNAM PHASE OPTICAL BEAM DEFLECTORS [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1437514337

    APA Style (7th edition)

  • Cheng, HsienHui. HIGH EFFICIENCY DOUBLE TWIST PANCHARATNAM PHASE OPTICAL BEAM DEFLECTORS. 2015. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1437514337.

    MLA Style (8th edition)

  • Cheng, HsienHui. "HIGH EFFICIENCY DOUBLE TWIST PANCHARATNAM PHASE OPTICAL BEAM DEFLECTORS." Doctoral dissertation, Kent State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1437514337

    Chicago Manual of Style (17th edition)

kent1437514337
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© 2015, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.