Figure 4From: Porous silicon microcavities: synthesis, characterization, and application to photonic barcode devicesTransmittance (a) and photoluminescence (b) spectra of a porous silicon microsphere of about 4.1-μm diameter. Dips in the transmittance spectrum correspond to the peaks in the photoluminescence spectrum. They are associated to the optical resonances of the microcavity (reprinted with the permission of[16]).Back to article page