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Rubicon Technology, Inc. Successfully Grows Largest Manmade Sapphire Crystal
At 200 kg, the "Super Boule" Represents the Next Generation of Sapphire Growth Technology and Sapphire Products

FRANKLIN PARK, Ill.--(BUSINESS WIRE)--Apr. 13, 2009-- Rubicon Technology, Inc. (NASDAQ:RBCN), a leading provider of sapphire substrates and products to the LED, RFIC, Semiconductor, and Optical industries, today announced it has successfully grown what the company believes is the world’s largest sapphire crystal. The super boule weighs in at 200 kg (441 lbs.) and will enable Rubicon to offer high quality large-size optical windows and next generation wafer products with dimensions over 12 inches.

Currently, Rubicon grows bulk sapphire crystals up to 85kg in production volumes and provides large diameter sapphire wafers up to 8 inch diameters and optical windows up to 10 inch dimensions. Key differentiators are Rubicon’s ability to provide large size windows and wafers in c-plane orientation as well as all other orientations and to provide robust, high quality optical parts in thicknesses that meet any customer requirements. Rubicon’s proprietary ES2 crystal growth technology and sapphire processing capabilities can continue to be scaled to produce even larger-size sapphire products in the future.

“We have once again demonstrated our capabilities as a leader in sapphire growth technology for large-size sapphire by successfully growing this unprecedented sapphire crystal,” said Raja Parvez, CEO of Rubicon Technology. “This growth capability now opens the door for Rubicon to provide customers with even larger size, very high-quality, sapphire products. The “super boule” growth process will soon be operationalized into production volumes which will enable new applications for sapphire windows and wafers.”

Sapphire is an ideal material for optical uses due to its excellent transmission in UV and IR wavelengths, and rugged durability under even the harshest of conditions. Sapphire substrates are also used in very high volume production for high brightness LEDs and for high performance radio frequency integrated circuits. Key products for large area sapphire include military applications such as windows for unmanned air vehicles, targeting pods, submarine windows and transparent armor. Other applications include aerospace windows, pressure vessel windows, semiconductor process equipment parts and sensor windows for fire safety, oil exploration and chemical processing.

About Rubicon Technology, Inc.

Rubicon Technology, Inc. is an advanced electronic materials provider that is engaged in developing, manufacturing and selling monocrystalline sapphire and other crystalline products for light-emitting diodes (LEDs), radio frequency integrated circuits (RFICs), blue laser diodes, optoelectronics and other optical applications. The Company applies its proprietary crystal growth technology to produce very high-quality sapphire in a form that allows for volume production of various sizes and orientations of substrates and windows. Rubicon is a vertically-integrated manufacturer with capabilities in crystal growth, high precision core drilling, wafer slicing, surface lapping, large-diameter polishing and wafer cleaning processes, which the Company employs to convert the bulk crystal into products with the quality and precision specified by its customers. The Company is actively developing larger diameter products to support next-generation LED, RFIC and optical window applications.

Further information is available at http://www.rubicon-es2.com.

Source: Rubicon Technology, Inc.

Rubicon Technology, Inc.
William Weissman
Chief Financial Officer
847-457-3610