Simple analytical expressions for the reflectivity and the penetration depth of a Bragg mirror between arbitrary media

Brovelli, L. R.; Keller, U.

doi:10.1016/0030-4018(95)00084-l

Cited by 59 publications

(47 citation statements)

References 5 publications

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“…An asymmetric Fabry-Perot cavity is usually formed by a less reflective front mirror with a reflectivity R f and a back semiconductor distributed Bragg reflector (DBR) [11] with an almost 100% reflectivity R b . The DBR is formed by piling pairs of quarter-wavelength (λ/4) layers that are composed of semiconductors with alternating high and low refractive indices (n).…”

Section: Introductionmentioning

confidence: 99%

Optical switching in a resonant Fabry–Perot saturable absorber

Tang¹,

Siahmakoun²,

Granieri³

et al. 2006

J. Opt. A: Pure Appl. Opt.

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We experimentally demonstrate optical switching in a Fabry-Perot saturable absorber using a pump-probe technique. The saturable absorbers are multiple quantum wells, 35 and 42 pairs of alternating layers of 7 nm thick compressively strained Ga 0.42 In 0.58 AsP. These quantum wells are separated by 8 nm thick InP barriers. The reflectivity of these samples as a function of the input optical power is theoretically and experimentally investigated. A switching rate of better than 20 MHz is observed. This optical switching is based on the mechanism of controlling the reflectivity of the Fabry-Perot saturable absorber, while operating at its resonant wavelength, by the pump power. Optical switching speed of 10 ns is possible.

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Section: Introductionmentioning

confidence: 99%

Optical switching in a resonant Fabry–Perot saturable absorber

Tang¹,

Siahmakoun²,

Granieri³

et al. 2006

J. Opt. A: Pure Appl. Opt.

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“…withn being the average refractive index, λ B ¼ 2nΛ the Bragg wavelength, Λ the DBR period, n the Ga 2 O 3 refractive index, and Δn the refractive-index contrast [61]. We obtain a penetration depth value of δ eff ¼ 900 nm, but we remark that this is a rough estimation.…”

Section: Resultsmentioning

confidence: 92%

Modal Analysis of β−Ga2O3:Cr Widely Tunable Luminescent Optical Microcavities

et al. 2018

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Optical microcavities are key elements in many photonic devices, and those based on distributed Bragg reflectors (DBRs) enhance dramatically the end reflectivity, allowing for higher quality factors and finesse values. Besides, they allow for wide wavelength tunability, needed for nano-and microscale light sources to be used as photonic building blocks in the micro-and nanoscale. Understanding the complete behavior of light within the cavity is essential to obtaining an optimized design of properties and optical tunability. In this work, focused ion-beam fabrication of high refractive-index contrast DBR-based optical cavities within Ga 2 O 3 ∶Cr microwires grown and doped by the vapor-solid mechanism is reported. Room-temperature microphotoluminescence spectra show strong modulations from about 650 nm up to beyond 800 nm due to the microcavity resonance modes. Selectivity of the peak wavelength is achieved for two different cavities, demonstrating the tunability of this kind of optical system. Analysis of the confined modes is carried out by an analytical approximation and by finite-difference-time-domain simulations. A good agreement is obtained between the reflectivity values of the DBRs calculated from the experimental resonance spectra, and those obtained by finite-difference-time-domain simulations. Experimental reflectivities up to 70% are observed in the studied wavelength range and cavities, and simulations demonstrate that reflectivities up to about 90% could be reached. Therefore, Ga 2 O 3 ∶Cr high-reflectivity optical microcavities are shown as good candidates for single-material-based, widely tunable light emitters for micro-and nanodevices.

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“…There are several ways to compute a more accurate reflection coefficient [8,9]. In this paper, the F matrix with a simple description is used and the filter characteristics are confirmed [5,6].…”

Section: More Accurate Calculation Of Reflectivitymentioning

confidence: 99%