All-silicon omnidirectional mirrors based on one-dimensional photonic crystals

Bruyant, A.; Lérondel, G.; Reece, P. J.; Gal, M.
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3227
Academic Journal
We report on the fabrication of monolithic omnidirectional mirrors based on one-dimensional photonic crystals. The mirrors are comprised of chirped and unchirped multiple layers of microporous silicon. Porosities have been chosen to achieve an optimal low refractive index n[SUBL] ∼1.5 and a high refractive index n[SUBH] ∼ 2.55. Unchirped structures, centered in the near-infrared, exhibit an omnidirectional reflection band of 100 nm, in agreement with the calculated photonic band structure. Chirped structures exhibit an enlarged omnidirectional stop band (340 nm). Given the possibility of easily tailoring the optical thickness of porous silicon, this material is shown to be very practical for engineering omnidirectional mirrors.


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