Abstract
We present the results of a detailed study of the mechanism and dynamics of holographic Bragg grating formation in azo-dye doped blue-phase liquid crystals. The principal mechanism leading to refractive index modulation is lattice distortion caused by photo-activated trans–cis isomerism of the azo-dye dopant. High diffraction efficiency bulk (Bragg) gratings with grating spacing as small as 1 μm can be written with low optical power and do not require specific optical field polarisation. Furthermore, the written grating can be prolonged by uniform illumination with another laser, instead of being erased. Azo-doped blue-phase liquid crystals thus present themselves as highly promising photosensitive materials for high-resolution holographic recording and image processing application. An experimental demonstration of holographic image reconstruction via optical phase conjugation with excellent aberration correction capability is presented.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1944-1952 |
| Number of pages | 9 |
| Journal | Liquid Crystals |
| Volume | 45 |
| Issue number | 13-15 |
| DOIs | |
| State | Published - Dec 8 2018 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
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Polarisation-free and high-resolution holographic grating recording and optical phase conjugation with azo-dye doped blue-phase liquid crystals. / Ho, Tsung Jui; Chen, Chun Wei; Khoo, Iam-choon.
In: Liquid Crystals, Vol. 45, No. 13-15, 08.12.2018, p. 1944-1952.Research output: Contribution to journal › Article
TY - JOUR
T1 - Polarisation-free and high-resolution holographic grating recording and optical phase conjugation with azo-dye doped blue-phase liquid crystals
AU - Ho, Tsung Jui
AU - Chen, Chun Wei
AU - Khoo, Iam-choon
PY - 2018/12/8
Y1 - 2018/12/8
N2 - We present the results of a detailed study of the mechanism and dynamics of holographic Bragg grating formation in azo-dye doped blue-phase liquid crystals. The principal mechanism leading to refractive index modulation is lattice distortion caused by photo-activated trans–cis isomerism of the azo-dye dopant. High diffraction efficiency bulk (Bragg) gratings with grating spacing as small as 1 μm can be written with low optical power and do not require specific optical field polarisation. Furthermore, the written grating can be prolonged by uniform illumination with another laser, instead of being erased. Azo-doped blue-phase liquid crystals thus present themselves as highly promising photosensitive materials for high-resolution holographic recording and image processing application. An experimental demonstration of holographic image reconstruction via optical phase conjugation with excellent aberration correction capability is presented.
AB - We present the results of a detailed study of the mechanism and dynamics of holographic Bragg grating formation in azo-dye doped blue-phase liquid crystals. The principal mechanism leading to refractive index modulation is lattice distortion caused by photo-activated trans–cis isomerism of the azo-dye dopant. High diffraction efficiency bulk (Bragg) gratings with grating spacing as small as 1 μm can be written with low optical power and do not require specific optical field polarisation. Furthermore, the written grating can be prolonged by uniform illumination with another laser, instead of being erased. Azo-doped blue-phase liquid crystals thus present themselves as highly promising photosensitive materials for high-resolution holographic recording and image processing application. An experimental demonstration of holographic image reconstruction via optical phase conjugation with excellent aberration correction capability is presented.
UR - http://www.scopus.com/inward/record.url?scp=85049575058&partnerID=8YFLogxK
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U2 - 10.1080/02678292.2018.1491068
DO - 10.1080/02678292.2018.1491068
M3 - Article
AN - SCOPUS:85049575058
VL - 45
SP - 1944
EP - 1952
JO - Liquid Crystals
JF - Liquid Crystals
SN - 0267-8292
IS - 13-15
ER -