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We propose an original and efficient method to engineer a defect between twowell-ordered silica opals by sputtering silica on the top of the first one. Asthe amount of sputtered silica can be well controlled, it is also the case forthe thickness of the layer and consequently for the spectral position of thedefect mode. The optical response of these sandwich structures is studied interms of specular reflection and transmission spectroscopy. Tunable highlytransmitted and reflected optical modes are evidenced. The very good agreementbetween the experimental results and the simulations, run without fittingparameters, demonstrates the almost perfect order of the synthesizedstructures.

Sputtered-silica defect layer in artificial opals: tunability of highly transmitted and reflected optical modes