Abstract
Microcavities for the mid-infrared range with very high quality factors were fabricated by molecular beam epitaxial growth of IV–VI semiconductor layers. The samples consist of PbTe/EuTe and Pb0.95Eu0.05Te/EuTe Bragg mirrors with three to five layer pairs rendering reflectivities well above 99%. The transmission spectrum of a Pb0.95Eu0.05Te2λ cavity shows three Lorentzian shaped Fabry–Perot resonances in the mirror stop band, whereas a PbTe λ/2 microcavity exhibits one narrow resonance maximum at 1336cm−1 (λ=7.48μm) with a full-width at half-maximum of 0.7cm−1. This corresponds to a very high effective cavity finesse of 1100, which is to the best of our knowledge the highest value for the mid infrared spectral region.
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