Optical transmission and reflection spectra were measured using microscopy-based spectroscopic techniques. At visible wavelengths, an upright microscope (Olympus BX-63) with combined spectrometer and cooled CCD (SP2150 and PIXIS 256E, Teledyne Princeton instruments) was implemented. For MIR wavelengths, FT-IR (FTIR-6600, JASCO) with microscope accessory (IRT-1000, JASCO) was used. The reference of transmission and reflection was a broad-band reflection mirror (100% from 400 nm to 2000 nm) and Au-mirror (98% at MIR wavelengths). Air ambient was used for the transmission measurements.