1. Liquid Crystal Lenses Presentation On By: Dheeraj Kumar
M.Tech (Nanotechnology)

2. Rigid
Fixed Shape
Fixed Volume
Not Rigid
No Fixed Shape
Fixed Volume
Not Rigid
No Fixed Shape
No Fixed Volume

3. Solid LC
Liquid

4. Why Liquid Crystal? Molecular re-orientation under the influence
of an electric field
Deformation in shape of LC under field
induced

5. Applications of LC LC Lenses Displays and Projectors Thermometers
Light Modulators and Switched
Material Testing
Chemical Probes
Rewritable Optical Data Storages

6. Liquid Crystal Lenses Principle:
In 1977 by Bricor
Principle:
Change in the electric field applied to the LC,
leads to the change in the refractive index of material

7. Working
Conventional: If the surface of the isotropic medium is polished with a spherical shape,
then it functions as a Lens
Positive Lens: Incident ray experiences a gradually
increment in refractive index from the border to center
Negative Lens: Incident ray experiences a gradually
decrement in refractive index from the border to center

8. Conventional: If the surface of the isotropic medium is polished with a spherical shape,
then it functions as a Lens

9. Positive Lens: Incident ray experiences a
gradually increment in refractive index
from the border to center
Negative Lens: Incident ray experiences a
Gradually decrement in refractive index
from the border to center

10. Types of LC Lenses Larger than 1mm aperture Smaller than 1mm aperture
Pico Projectors
Cell Phones Screen
Endoscopic Systems
Ophthalmic Lenses
Smaller than 1mm aperture
Micro-lens arrays
Optical Communication
Lab on a Chip
Switchable 2D/3D displays

11. Real-Time Liquid Crystal Fabrication
By: University of Central Florida (At Optical Society of America in 2007)
Put a drop of photosensitive
polymer on the top of the
substrate
Turn the substrate up-side down
Coat a conductive polymer layer
as electrode
Flatten the lens surface by the
same polymer

12. Photosensitive polymer is NOA81 (Norland Optical Adhesive), Ref
***Photosensitive polymer is NOA81 (Norland Optical Adhesive), Ref. Index = 1.52

13. Observation of interference rings of lens cell using a microscope
Sample was placed between two
Cross polarizers
The rubbing direction of the lens
cell was oriented at 45°

15. Conventional vs LC

16. Advantages of LC Lenses
Tunable Focusing
Low Power Consumption
Compact Structure
Good Stability
Simple Fabrication
Voltage Actuation
Planar Simple Structure

17. Disadvantages of LC Lenses
Polarization Dependent
Slow Response Time

18. References: 1. https://lcp.elis.ugent.be/tutorials/lc/lc1
2. Liquid crystal lens with large focal length tunability and low operating voltage
Hongwen Ren, David W. Fox, Benjamin Wu, and Shin-Tson Wu
College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816
3. Micromachines 2014, 5, ; doi: /mi
4. An Electrically Tunable Liquid Crystal Lens for Fiber Coupling and Variable Optical Attenuation
Michael Chen, Chyong-Hua Chen, Yin-Chieh Lai, and Yi-Hsin Lin*
Department of Photonics, National Chiao Tung University, Hsinchu, 30010, R O C, Taiwan
5. Liquid Crystal Lens for Focusing and Zooming Systems Dr. Susumu SATO (Akita Prefectural R & D Center )