Direct spectroscopy of a deep two-dimensional photonic crystal microresonator -: art. no. 233102

Photonic crystals based on macroporous silicon with fundamental band gaps in the middle infrared region 3.4-5.8 mum were fabricated. Scanning probe optical microscopy and laser spectroscopy were combined to examine a deep two-dimensional photonic crystal microresonator based on a single point defect. Two sharp resonances were recorded in the band gap, in excellent agreement with the results of numerical simulations. Such a microresonator with high-quality factors and a subwavelength mode extension could be used for a range of applications including integrated optical gas sensors.