We present two characterization methods for accurate measurement of the reflection coefficient of photonic crystal reflectors. Photonic crystal reflectors on the indium phosphide membrane on silicon (IMOS) are designed, simulated and fabricated to validate two characterization methods. The two methods give a reliable interval for the actual value of the reflection. Furthermore, we demonstrate photonic crystal reflectors with reflection coefficients over 95%, and a 50 microns long Fabry-P?rot cavity with a quality factor of almost 16,000.
We present waveguide photonic crystal reflectors on the InP-membrane-on-silicon (IMOS) platform, and a method to accurately measure the reflectivity of those reflectors. The photonic crystal holes are patterned on a waveguide using electron-beam lithography and etched through the waveguiding layer to create a broadband distributed Bragg reflector. We show simulations of these reflectors and experimental results of fabricated devices, both showing a high, free-to-choose reflectivity, and high quality factor Fabry-Pérot cavities. We experimentally show reflectivities higher than 95% for the reflectors and a quality factor as high as 15,911±511 for a Fabry-Pérot cavity, using reflectors with a length of only 4 microns. For the first time, to our knowledge, two methods for measuring the reflectivity are used for characterization of on-chip reflectors to accurately determine the reflection. The first method is based on analysis of the transmission through a Fabry-Pérot cavity, the second is based on a direct four-port measurement of the reflector. A systematic error is made in both methods, resulting in an upper and lower boundary for the actual reflection coefficient.