Kyungpook National University Industry-academic Cooperation Foundation

Korea Research Institute of Chemical Technology

Kyung-Il Joo

Hak-Rin Kim

Min-Kyu Park

Tae-Hyun Lee

Mi-Hye Yi

Jae-Won Ka

Ae-Jin Yeon

An active random refraction device includes a random structure having the same refractive index characteristics regardless of polarization direction of light, a liquid crystal polymer on the random structure with refractive index characteristics changing according to polarization direction of the light, a polarization switching device, and a refractive surface with an inclination angle randomly distributed along the horizontal direction perpendicular to the incident direction of the light. The active random refraction device can be switched between a transmission mode and a refractive mode according to the polarization of the light.

Field of view and coherence active control random refraction device and manufacturing method therefor

Disclosed are a holographic writing method and apparatus capable of re-writing (updating) holographic information and quickly writing the holographic information with high efficiency. In an embodiment, a holographic writing method for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, writes the holographic information by using a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of photoisomer molecule structures of the holographic recording medium. The maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum. A difference between the light absorption rates of the photoisomer molecule structures at the writing wavelength is less than a difference between the light absorption rates of the photoisomer molecule structures at the maximum absorption wavelength.

Holographic writing method and holographic writing apparatus

Provided is a polarization-dependent lens structure. The lens structure includes an optically-isotropic polymer layer having a reverse lens shape on a first surface and a lens portion where the surface of the optically-isotropic polymer layer is filled with liquid crystalline polymers, nano-scale 1D lattice structures (nano-scale grooves) are formed on an upper surface thereof, and the liquid crystalline polymers are aligned by the nano-scale 1D lattice structures along a direction of long axes of the 1D lattice structures, wherein it is determined according to a polarization direction of incident light whether or not the polarization-dependent lens structure operates as a lens.

Polarization-dependent lens structure and method of manufacturing the same

Growing community of inventors

Daegu, South Korea

Kyung-Il Joo