A theoretical analysis of mode-mixing in optical waveguides with nearest-neighbour mode coupling

1976 ◽  
Vol 8 (1) ◽  
pp. 23-30 ◽  
Author(s):  
M. O. Vassell
Keyword(s):  
Theoretical Analysis ◽  
Optical Waveguides ◽  
Mode Coupling ◽  
Nearest Neighbour ◽  
Mode Mixing

Mode-Coupling SRLS versus Mode-Decoupled Model-Free N−H Bond Dynamics:  Mode-Mixing and Renormalization

2003 ◽  
Vol 107 (36) ◽  
pp. 9898-9904 ◽  
Author(s):  
Eva Meirovitch ◽  
Yury E. Shapiro ◽  
Zhichun Liang ◽  
Jack H. Freed
Keyword(s):  
Mode Coupling ◽  
Model Free ◽  
Mode Mixing

An Improved Tunable Piezoelectric Energy Harvesting Structure Based on d33 Mode Coupling

2015 ◽  
Vol 1092-1093 ◽  
pp. 136-140
Author(s):  
Yang Zhao ◽  
Kun Peng Wang ◽  
Ying Tai Li ◽  
Ming Jie Guan
Keyword(s):  
Energy Harvesting ◽  
Theoretical Analysis ◽  
Mode Coupling ◽  
Frequency Variation ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Piezoelectric Elements ◽  
Piezoelectric Harvester

This research proposes an improved tunable piezoelectric harvester structure which is constructed by a cantilever base beam and piezoelectric elements working in d33 mode. Our previous work on tunable piezoelectric harvester structure showed a frequency variation ratio of 3.17% with piezoelectric elements working in d31mode coupling. In this work, by changing the working mode of the piezoelectric elements from d31 to d33 mode, the frequency variation ratio was shown to be much higher. Theoretical analysis of the improved structure was investigated and verified with simulations. The results showed that the d33 mode coupling surpasses the d31 mode coupling with a frequency variation ratio of 29.74%.

Theoretical analysis of the mode coupling induced by heat of large-pitch micro-structured fibers

2015 ◽  
Vol 24 (2) ◽  
pp. 024208 ◽  
Author(s):  
Hai-Tao Zhang ◽  
Dan Chen ◽  
Jie Hao ◽  
Ping Yan ◽  
Ma-Li Gong
Keyword(s):  
Theoretical Analysis ◽  
Mode Coupling

Buried Concentration Profiles for Optical Waveguides by One-Step Electro-Diffusion Process: Theoretical Analysis

1991 ◽  
Vol 228 ◽  
Author(s):  
Xiaoming Li ◽  
Paul F. Johnson
Keyword(s):  
Theoretical Analysis ◽  
Electric Field ◽  
Optical Waveguides ◽  
Diffusion Processes ◽  
Silver Ions ◽  
Point Of View ◽  
Concentration Profiles ◽  
Step Process ◽  
Practical Operation ◽  
One Step

IntroductionIn recent years, a two-step electric field assisted diffusion or ion-exchange technique has been extensively studied for producing buried concentration profiles in glass [1,2,3], polymer [4,5], electrooptic and semiconducting [6,7] substrate materials to fabricate buried optical waveguide devices. The technique contains two separate diffusion processes and is quite complicated, cost and time consuming. In addition, theoretical analysis of the technique is too complicated to be used for calculating and tailoring concentration profiles. Many efforts have been made to pursue a one-step process for producing buried profiles. Very recently, a novel one-step technique [8] involving electric field assisted diffusion of silver ions into glass from molten AgNO3 bath with decaying silver concentration has been developed to produce buried Ag+ concentration profiles in glass substrate. The new technique is, from the practical operation point of view, relatively simple and is a significant improvement over the conventional two-step process.

Exchange interactions in antiferromagnetic salts of iridium. I. Paramagnetic resonance experiments

1959 ◽  
Vol 250 (1260) ◽  
pp. 84-96 ◽  
Keyword(s):  
Magnetic Susceptibility ◽  
Theoretical Analysis ◽  
Resonance Spectrum ◽  
Exchange Interactions ◽  
Ammonium Salts ◽  
Nearest Neighbour ◽  
Helium Temperature ◽  
Paramagnetic Resonance ◽  
Anisotropic Part ◽  
Rhombic Symmetry

Paramagnetic resonance methods have been used to investigate Ir-Ir exchange interactions in K 2 IrCl 6 and (NH 4 ) 2 IrCl 6 . Measurements are described of the resonance spectrum from nearest-neighbour pairs of Ir ions in semi-dilute mixed crystals where Pt is substituted for Ir. The results show that the isotropic p art of the Ir-Ir exchange, J / k , is antiferromagnetic and of magnitude 11.5 ± 1°K and 7.5 ± 1°K for the potassium and ammonium salts, respectively. There is also found to be an anisotropic part with rhombic symmetry and with magnitude of order 1 cm -1 . No lines attributable to next-nearest-neighbour pairs were found, and it is suggested that this interaction is small. The results are com pared briefly with the magnetic susceptibility experiments of Cooke et al . (part II) who find that the concentrated salts go antiferromagnetic in the liquid-helium temperature range, and also with the theoretical analysis of the superexchange mechanism given by Judd (part III).

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