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We report a new concept of biochemical sensor device based on long-period grating structures UV-inscribed in D-fiber. The surrounding-medium refractive index sensitivity of the devices has been enhanced significantly by a hydrofluoric acid etching process. The devices have been used to measure the sugar concentrations showing clearly an encoding relation between the chemical concentration and the grating spectral response, demonstrating their capability for potential biochemical sensing applications.

proceedings of spie, the international society for optical engineering/proceedings of spie

&lt;title&gt;Optical biochemical sensors based on long-period fiber gratings UV-inscribed in D-fiber with enhanced sensitivity by HF etching process&lt;/title&gt;