Temperature changes of micro-optical elements can be expected in applications such as telecommunication and laser machining. We present a comparative study of diffractive gratings fabricated in benzocyclobutene (BCB) and in a conventional photoresist under the influence of elevated temperature. We measured variations in both optical diffraction efficiency and topography by heating the samples to 300 °C in air in a specially built oven. Our main findings show that gratings fabricated in BCB exhibit small changes, both optically and topographically, during the first 45 min, whereas the conventional photoresist gratings change drastically within just a few minutes.
© 2001 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(140.6810) Lasers and laser optics : Thermal effects
(160.4760) Materials : Optical properties
(160.5470) Materials : Polymers
(350.3950) Other areas of optics : Micro-optics
Anna Strååt and Fredrik Nikolajeff, "Study of Benzocyclobutene as an Optical Material at Elevated Temperatures," Appl. Opt. 40, 5147-5152 (2001)