Calculation of the finesse of an ideal Fabry–Perot resonator

Suter, M.; Dietiker, Peter

doi:10.1364/ao.53.007004

Cited by 29 publications

(10 citation statements)

References 6 publications

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“…The highest absorption value obtained in the asymmetric reflective FP3 filter is due to the fact that the incident light inside the cavity is reflected a greater number of times which allows to graphene a higher number of multiple absorptions. The number of reflections is in fact related to the Fabry–Perot finesse which is defined by [ 68 , 88 , 89 , 90 ]:

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Section: Resultsmentioning

confidence: 99%

Towards Perfect Absorption of Single Layer CVD Graphene in an Optical Resonant Cavity: Challenges and Experimental Achievements

et al. 2022

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Graphene is emerging as a promising material for the integration in the most common Si platform, capable to convey some of its unique properties to fabricate novel photonic and optoelectronic devices. For many real functions and devices however, graphene absorption is too low and must be enhanced. Among strategies, the use of an optical resonant cavity was recently proposed, and graphene absorption enhancement was demonstrated, both, by theoretical and experimental studies. This paper summarizes our recent progress in graphene absorption enhancement by means of Si/SiO2-based Fabry–Perot filters fabricated by radiofrequency sputtering. Simulations and experimental achievements carried out during more than two years of investigations are reported here, detailing the technical expedients that were necessary to increase the single layer CVD graphene absorption first to 39% and then up to 84%. Graphene absorption increased when an asymmetric Fabry–Perot filter was applied rather than a symmetric one, and a further absorption increase was obtained when graphene was embedded in a reflective rather than a transmissive Fabry–Perot filter. Moreover, the effect of the incident angle of the electromagnetic radiation and of the polarization of the light was investigated in the case of the optimized reflective Fabry–Perot filter. Experimental challenges and precautions to avoid evaporation or sputtering induced damage on the graphene layers are described as well, disclosing some experimental procedures that may help other researchers to embed graphene inside PVD grown materials with minimal alterations.

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…”

Section: Resultsmentioning

confidence: 99%

Towards Perfect Absorption of Single Layer CVD Graphene in an Optical Resonant Cavity: Challenges and Experimental Achievements

et al. 2022

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“…where R is the cavity mirror reflectivity 44,45 . In this absorber design, we use the dielectric nanowire grids as the cavity mirrors, so that the higher reflectivity will be obtained.…”

Section: Resultsmentioning

confidence: 99%

Ultra-narrowband dielectric metamaterial absorber with ultra-sparse nanowire grids for sensing applications

Liao

Zhao

2020

Sci Rep

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Due to their low losses, dielectric metamaterials provide an ideal resolution to construct ultranarrowband absorbers. To improve the sensing performance, we present numerically a near-infrared ultra-narrowband absorber by putting ultra-sparse dielectric nanowire grids on metal substrate in this paper. The simulation results show that the absorber has an absorption rate larger than 0.99 with full width at half-maximum (FWHM) of 0.38 nm. The simulation field distribution also indicates that the ultra-narrowband absorption is originated from the low loss in the guided-mode resonance. thanks to the ultra-narrow absorption bandwidths and the electric field mainly distributed out of the ultra-sparse dielectric nanowire grids, our absorber has a high sensitivity S of 1052 nm/RIU and a large figure of merit (FOM) of 2768 which mean that this ultra-narrowband absorber can be applied as a high-performance refractive index sensor.Metamaterials are built with artificially constructed materials which can be manipulated to produce exotic optical properties such as super-lenses 1 , negative refraction 2 , asymmetric transmission 3 , cloaking 4 and absorbers 5 . Among them, metamaterials absorbers, which can realize near-perfect absorption by designing the nanostructures, are very appealing because they can be applied in photodetectors 6,7 , sensors 8 , thermo-photovoltaics (TPV) 9 , thermal emitters 10,11 , and solar cells 12,13 . So far, a variety of metamaterials absorbers have been proposed with different bandwidths to meet the different application demands. To achieve high performance, lots of efforts have been devoted to broadening or narrowing the absorption bandwidths [14][15][16][17][18] . For example, the broadband absorbers are usually designed to be applied in photodetectors and solar cells 19,20 . On the other hand, the absorbers with narrower absorption bandwidth have better performance in the applications of thermal emitters and sensors 8,21 . Up to date, some ultra-narrowband absorbers have been proposed by manipulating electromagnetic resonance in metallic microstructures [22][23][24][25][26] .In recent years, it has been found that dielectric metamaterials (DMs) composed of dielectric microstructures can also be used to manipulate electromagnetic resonance [27][28][29][30][31][32] . Due to the unique advantage of the low loss, dielectric metamaterials provide an ideal resolution for narrowing the absorption bandwidth [33][34][35] . In addition, the ultra-narrowband absorbers were reported by using dielectric microstructures recently 36,37 . However, how to improve the sensing performance of a dielectric metamaterial absorber is still under exploration. On the other hand, it is well known that the sensing performance of an absorber can be evaluated by sensitivity = The absorption properties of the proposed structure can be explored by the reflectance spectra. In the experiment setup, a tungsten lamp can be used as the broadband light source. The resonance absorption peaks can be achieved with a spectrometer. In ...

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“…each peak can be obtained from the ratio of the full width at half maximum of one peak Δν FWHM and the free spectral range between this peak and the next one δν FSR . From these values, reflectivity (R) and finesse (F) can be related by F ¼ ½π ffiffiffi ffi R p =ð1 − RÞ [52]. As shown in Table I, for cavity 1 in perpendicular polarization, F ¼ 5.1 for the 709-nm peak and F ¼ 7.5 for the peak at 798 nm, resulting in 55% and 66% reflectivity, respectively.…”

Section: Resultsmentioning

confidence: 99%

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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Calculation of the finesse of an ideal Fabry–Perot resonator

Cited by 29 publications

References 6 publications

Towards Perfect Absorption of Single Layer CVD Graphene in an Optical Resonant Cavity: Challenges and Experimental Achievements

Towards Perfect Absorption of Single Layer CVD Graphene in an Optical Resonant Cavity: Challenges and Experimental Achievements

Ultra-narrowband dielectric metamaterial absorber with ultra-sparse nanowire grids for sensing applications

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

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