Electronics and Telecommunications Research Institute

Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Bong-Je Park

Ki-Uk Kyung

Sun-Tak Park

Sae-Kwang Nam

Sung-Ryul Yun

Shang-hyeun Park

Tae-won Jeong

Kyong-Hon Kim

Duk-Young Jeon

Ji-yon Han

Yong-Gyu Choi

A microlens array and a method for fabricating thereof are provided. The microlens array of the present invention comprises a lens structure part formed by bistable dielectric polymer thin film; first and second electrode parts each formed on the upper surface and the bottom surface of the lens structure part to apply voltage for shape changes of the lens structure part; a circuit part applying heat to the dielectric polymer thin film to change the property of the dielectric polymer thin film to be soft; and a base part formed on the bottom surface of the second electrode in predetermined intervals. The method further comprises a hydraulic part to apply predetermined voltage to the bottom surface of the lens structure part. The microlens array is thus able to change optical properties by deform the shape of a transparent dielectric polymer thin film having bistablity to various sizes of lens shapes by the purposes.

Microlens array and method for fabricating thereof

Disclosed herein is a shape-variable optical element including: a shape-variable lens; a first electrode unit configured to be connected to the shape-variable lens; a second electrode unit configured to face the first electrode unit; and a deformation part configured to be disposed between the first electrode unit and the second electrode unit.

Shape-variable optical element

An active diffuser for reducing a speckle in accordance with an embodiment of the present invention includes: an electroactive polymer film having at least one or more scattering patterns; a first transparent electrode coated on one surface of the electroactive polymer film; and a second transparent electrode coated on the other surface of the electroactive polymer film, and a shape of the scattering pattern of the electroactive polymer film is varied by voltage applied through the first transparent electrode and the second transparent electrode.

Active diffuser for reducing speckle and laser display device having active diffuser

An optical read/write device in accordance with an embodiment of the present invention includes a lens portion configured to irradiate light emitted from a light source to an optical recording medium, and the lens portion includes: a flexible shape-variable lens; and an electrode portion provided on the shape-variable lens. The shape of the shape-variable lens can be changed when voltage is applied to the electrode.

Shape-variable optical element and optical read/write device including the same

A phosphor represented by Formula 1:ZnS:Cu,Cl,Mn,Te.&#x2003;&#x2003;Formula 1

Phosphor, white light emitting device including the phosphor and method of preparing the phosphor

An optical amplifier of the present invention includes a pump source for generating a pumping light, a wavelength division multiplexing (WDM) coupler for multiplexing an inputted optical signal and the pumping light and an optical fiber including a core and a clad, wherein the core has holmium ions less than 0.5 mole % and the clad has ions selected from the group consisting of transition metal ions, rare earth ions and a combination thereof. In addition, the phonon energy of a host material is less than 600 cm and an absorption band at short-wavelength side is shorter than 530 nm.

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Daejeon, South Korea

Bong-Je Park