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20 April 2006 Polymeric variable optical attenuator based on surface plasmon polariton
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We propose a polymeric variable optical attenuator based on long range surface plasmon polaritons (LRSPPs) along a thin metal stripe embedded in polymers. The device is operated by controlling radiation loss of the LRSPP mode resulting from the temperature gradient of the polymer cladding caused by a heater. For guiding LRSPPs and efficient coupling of single mode fibers, gold stripes with 20-nm thickness, 4-μm width and 1-cm length are utilized. To obtain long physical lifetime, the heater is formed on the top of the polymer cladding with a 200-nm Au film which is about ten times thicker than the thin metal waveguide. The fabricated device is characterized at a wavelength of 1.55 μm, exhibiting high attenuation of less than 30 dB with the operating power of 100 mW. The fiber-to-fiber total insertion loss of 6.1 dB is achieved when using single mode fibers.
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Suntak Park, Yong-Sung Eom, Hyong Sik Won, and Seok Ho Song "Polymeric variable optical attenuator based on surface plasmon polariton", Proc. SPIE 6183, Integrated Optics, Silicon Photonics, and Photonic Integrated Circuits, 61831G (20 April 2006);

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