Radiation Modes and Roughness Loss in High Index-Contrast Waveguides

Poulton, Christopher G.; Koos, C.; Fujii, M.; Pfrang, Andreas; Schimmel, Th.; Leuthold, Juerg; Freude, W.

doi:10.1109/jstqe.2006.881648

Cited by 104 publications

(100 citation statements)

References 22 publications

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“…To calculate the amplitude coefficients for a given radiation mode in (4b), we assume that this radiation mode consists of a known free-space part, and a response field due to the presence of the waveguide. This in effect means that we treat each radiation mode as a perturbation of a free-space propagating wave, as explained in [14] and [27]. By applying this perturbation method, we gain not only the knowledge of the yet undetermined amplitude coefficients , but in addition, a means to normalize the radiation modes.…”

Section: Radiation-mode Fourier Decomposition Methodsmentioning

confidence: 99%

“…2 to give (12) (11) In (12), the upper limits for and are truncated from in (4b), to and respectively, which must be large enough to ensure convergence. The matrices in (12) are defined to be (13) (14) (15a)…”

Section: Radiation-mode Fourier Decomposition Methodsmentioning

confidence: 99%

“…In order to normalize the radiation modes, we only had to normalize their free-space part, as suggested in [14]and [27]. This normalization step is carried out in Appendix B.…”

Section: A Segmentation Of Radiation Modesmentioning

confidence: 99%

“…However, both of these methods are only approximate, and in some cases, might be rather inaccurate. A precise method was presented in [14], where the actual radiation modes of a high-index contrast nanowire were presented. However, the waveguides examined there were single mode, and so the focus was on the propagation loss alone.…”

mentioning

confidence: 99%

“…Other methods that have dealt with the subject in the past included the volume current method [15]- [18], finite-difference time domain (FDTD) [14], and ray tracing [19]. The volume current method treats roughness as an equivalent current source and loss is calculated by the outgoing radiation in the far field.…”

mentioning

confidence: 99%

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Radiation- and Bound-Mode Propagation in Rectangular, Multimode Dielectric, Channel Waveguides With Sidewall Roughness

Papakonstantinou

James

Selviah

2009

J. Lightwave Technol.

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Abstract-This paper calculates and displays accurate radiation modes for rectangular, multimode dielectric, channel waveguides, for the first time, and introduces the new semianalytical calculation method used to find them, the radiation-mode Fourier decomposition method (RFDM), which is an extension of the Fourier decomposition method (FDM) for finding bound propagating modes. The optimum choice of non-linear conformal transformation parameters is discussed for achieving highest accuracy. Once the radiation modes are known, the coupling coefficients can be found between the bound and radiation modes, as well as those between the bound modes themselves, andhence, the propagation loss can be found. The paper adapts Marcuse's coupled power theory, for the first time, to enable it to model propagation in rectangular, multimode dielectric, channel waveguides suffering from one dimensional sidewall roughness enabling the equilibrium distance to be calculated, at which rate of loss to radiation modes becomes constant, and to find that equilibrium propagation loss, and the dependence on the statistical properties of the wall roughness. This leads to the conclusion that at sufficient distance there exist two uncoupled modes, a symmetric and an asymmetric lowest order mode.

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Section: Radiation-mode Fourier Decomposition Methodsmentioning

confidence: 99%

Section: Radiation-mode Fourier Decomposition Methodsmentioning

confidence: 99%

“…In order to normalize the radiation modes, we only had to normalize their free-space part, as suggested in [14]and [27]. This normalization step is carried out in Appendix B.…”

Section: A Segmentation Of Radiation Modesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Radiation- and Bound-Mode Propagation in Rectangular, Multimode Dielectric, Channel Waveguides With Sidewall Roughness

Papakonstantinou

James

Selviah

2009

J. Lightwave Technol.

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Solvent Recrystallization‐Enabled Green Amplified Spontaneous Emissions with an Ultra‐Low Threshold from Pinhole‐Free Perovskite Films

Yin

Shang

et al. 2021

Adv Funct Materials

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Green and amplified spontaneous emissions with low thresholds are crucial for the development of solution-processable perovskite light sources. Although mixed-cation CsPbBr 3 perovskites are highly promising, pinholes are inevitably formed during the spin-coating process, which results in considerable optical losses. This study proposes a solvent recrystallization strategy to reduce the number of pinholes and enhance the crystallinity of (Cs, FA, MA) PbBr 3 /NMA (FA = CH(NH 2 ) 2 , MA = CH 3 NH 3 , and NMA = C 11 H 9 NH 3 ) films in a dimethyl sulfoxide gas environment. Amplified spontaneous green emissions are produced with a low threshold of 1.44 μJ cm −2 and a high net modal gain of 1176 cm −1 . The reduced threshold is attributed to the relatively low propagation loss and suppressed Auger recombination, which results from the formation of a pinhole-free surface and enlarged grain size. These results can be utilized in the development of high-performance perovskite laser devices.

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Light–matter interaction in photonic crystal slabs

Andreani

Gerace

2007

Physica Status Solidi (b)

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A theoretical treatment of waveguide-embedded photonic crystals based on a guided-mode expansion method is reviewed. The following issues are discussed: (i) a formulation of the method for calculating photonic-mode dispersion and intrinsic losses due to out-of-plane diffraction, (ii) modelling of disorderinduced losses due to fabrication imperfections, and (iii) a quantum-mechanical treatment of radiationmatter interaction, with application to exciton-polaritons in photonic crystal slabs.

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Radiation Modes and Roughness Loss in High Index-Contrast Waveguides

Cited by 104 publications

References 22 publications

Radiation- and Bound-Mode Propagation in Rectangular, Multimode Dielectric, Channel Waveguides With Sidewall Roughness

Radiation- and Bound-Mode Propagation in Rectangular, Multimode Dielectric, Channel Waveguides With Sidewall Roughness

Solvent Recrystallization‐Enabled Green Amplified Spontaneous Emissions with an Ultra‐Low Threshold from Pinhole‐Free Perovskite Films

Light–matter interaction in photonic crystal slabs

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