Design, fabrication and characterization of a distributed Bragg reflector for reducing the étendue of a wavelength converting system

Gao, Boxuan; George, John P.; Beeckman, Jeroen; Neyts, Kristiaan

doi:10.1364/oe.391080

Cited by 32 publications

(12 citation statements)

References 26 publications

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“…A classical thin-film Bragg reflector design consists of a so-called quarter-wave stack of alternating high- and low-index layers, where all layers are of the same optical path length

, with the intended photonic stop band’s center wavelength

[ 64 , 65 ]. The corresponding reflectance R at the center wavelength

, under normal incidence, is approximately given by

where

is refractive index of the substrate,

is the refractive index of the incident (ambient) region, and N is the number of repeating layers.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Photonic Materials Cloud: An Online Interactive Open Tool for Creating, Comparing, and Testing Photonic Materials

et al. 2022

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Recent advances in nanoscale fabrication and characterization further accelerated research on photonics and plasmonics, which has already attracted long-standing interest. Alongside morphological constraints, phenomena in both fields highly depend on the materials’ optical properties, dimensions, and surroundings. Building up the required knowledge and experience to design next-generation photonic devices can be a complex task for novice and experienced researchers who intend to evaluate the impact of subtle material and morphology variations while setting up experiments or getting a general overview. Here, we introduce the Photonic Materials Cloud (PMCloud), a web-based, interactive open tool for designing and analyzing photonic materials. PMCloud allows identification of the subtle differences between optical material models generated from a database, experimental data input, and inline-generated materials from various analytical models. Furthermore, it provides a fully interactive interface to evaluate their performance in important fundamental (numerical) optical experiments. We demonstrate PMCloud’s applicability to state-of-the-art research questions, namely the comparison of the novel plasmonic materials aluminium-doped zinc oxide and zirconium nitride and the design of an optical, dielectric thin-film Bragg reflector. PMCloud opens a rapid, freely accessible path towards prototyping optical materials and simple fundamental devices and may serve as an educational platform for photonic materials research.

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“…A classical thin-film Bragg reflector design consists of a so-called quarter-wave stack of alternating high- and low-index layers, where all layers are of the same optical path length

, with the intended photonic stop band’s center wavelength

[ 64 , 65 ]. The corresponding reflectance R at the center wavelength

, under normal incidence, is approximately given by

where

is refractive index of the substrate,

is the refractive index of the incident (ambient) region, and N is the number of repeating layers.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Photonic Materials Cloud: An Online Interactive Open Tool for Creating, Comparing, and Testing Photonic Materials

et al. 2022

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“…At the same time, the peaks become more intensive and symmetrical (Figure 3). It is well known that the intensity of resonant peaks is optimized by increasing both the number of periods and the refractive index contrast between the low and high refractive index segments (∆n) [30][31][32][33]. Since in this case the number of pairs is constant (20-cycle processes), it can be concluded that lower transmittance is caused by the enhancement of the latter parameter.…”

Section: Resultsmentioning

confidence: 99%

Charge Density-Versus Time-Controlled Pulse Anodization in the Production of PAA-Based DBRs for MIR Spectral Region

et al. 2021

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A robust and reliable method for fabricating porous anodic alumina (PAA)-based distributed Bragg reflectors (DBRs), operating in mid-infrared (MIR) spectral region, is presented. The method relies on application of high (UH) and low (UL) voltage pulse sequence repeated in cycles. PAA-based DBR consists of alternating high-(dH) and low-porosity (dL) layers translated directly into periodically varied refractive index. Two anodization modes were used: time- and charge density-controlled mode. The former generated dH + dL pairs with non-uniform thickness (∆d) and effective refractive index (∆neff). It is supposed, that owing to a compensation effect between the ∆d and ∆neff, the photonic stopbands (PSBs) were symmetrical and intensive (transmittance close to zero). Under the charge density-controlled mode dH + dL pairs of uniform thickness were formed. However, the remaining ∆neff provided an asymmetrical broadening of PSBs. Furthermore, it is demonstrated that the spectral position of the PSBs can be precisely tuned in the 3500–5500 nm range by changing duration of voltage pulses, the amount of charge passing under subsequent UH and UL pulses, and by pore broadening after the electrochemical synthesis. The material can be considered to be used as one-dimensional transparent photonic crystal heat mirrors for solar thermal applications.

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“…A variety of geometries, including Bragg reflectors, slabs, opals, microcavities, and colloids, can be used to construct PC structures. One-dimensional PCs, with one direction of periodicity, also known as Bragg stacks/reflectors, are used in antireflective coatings on glass and other optical surfaces [ 38 , 94 , 95 ].…”

Section: Synergizing Fluorescence and Pcsmentioning

confidence: 99%

“…( d ) Example structure of 1D PC slab with an alternating grating of high and low reflective index, adapted with permission from [ 38 ]. ( e ) Example emission of the guided emission from a distributed Bragg reflector (DBR) versus a non-optically active material, adapted with permission from [ 95 ].…”

Section: Figurementioning

confidence: 99%

Photonic Crystal Enhanced Fluorescence: A Review on Design Strategies and Applications

et al. 2023

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Nanoscale fluorescence emitters are efficient for measuring biomolecular interactions, but their utility for applications requiring single-unit observations is constrained by the need for large numerical aperture objectives, fluorescence intermittency, and poor photon collection efficiency resulting from omnidirectional emission. Photonic crystal (PC) structures hold promise to address the aforementioned challenges in fluorescence enhancement. In this review, we provide a broad overview of PCs by explaining their structures, design strategies, fabrication techniques, and sensing principles. Furthermore, we discuss recent applications of PC-enhanced fluorescence-based biosensors incorporated with emerging technologies, including nucleic acids sensing, protein detection, and steroid monitoring. Finally, we discuss current challenges associated with PC-enhanced fluorescence and provide an outlook for fluorescence enhancement with photonic-plasmonics coupling and their promise for point-of-care biosensing as well monitoring analytes of biological and environmental relevance. The review presents the transdisciplinary applications of PCs in the broad arena of fluorescence spectroscopy with broad applications in photo-plasmonics, life science research, materials chemistry, cancer diagnostics, and internet of things.

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Design, fabrication and characterization of a distributed Bragg reflector for reducing the étendue of a wavelength converting system

Cited by 32 publications

References 26 publications

Photonic Materials Cloud: An Online Interactive Open Tool for Creating, Comparing, and Testing Photonic Materials

Photonic Materials Cloud: An Online Interactive Open Tool for Creating, Comparing, and Testing Photonic Materials

Charge Density-Versus Time-Controlled Pulse Anodization in the Production of PAA-Based DBRs for MIR Spectral Region

Photonic Crystal Enhanced Fluorescence: A Review on Design Strategies and Applications

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