The mechanism of an electrically controlled variable optical attenuator is investigated based on the varying energy coupling efficiency of a light beam into a guided wave resonance. Compared to the conventional attenu...The mechanism of an electrically controlled variable optical attenuator is investigated based on the varying energy coupling efficiency of a light beam into a guided wave resonance. Compared to the conventional attenuated totalinternal reflection devices based on the surface plasmon resonance, the driving voltage for this attenuator is greatly reduced because of the newly chosen working interior angle. This letter explains the principle of attenuator operation and presents experimental results obtained on a realization of the device.展开更多
An analytic matrix method is used to analyze and accurately calculate the propagation constant and bending losses of a bent planar waveguide.This method gives not only a dispersion equation with explicit physical insi...An analytic matrix method is used to analyze and accurately calculate the propagation constant and bending losses of a bent planar waveguide.This method gives not only a dispersion equation with explicit physical insight,but also accurate complex propagation constants.展开更多
In combination with the transfer matrix method and the concept of an equivalent attenuated coefficient,a first-order perturbation theory is proposed to study the leaky modes in planar optical waveguides.Simplified ana...In combination with the transfer matrix method and the concept of an equivalent attenuated coefficient,a first-order perturbation theory is proposed to study the leaky modes in planar optical waveguides.Simplified analytical expressions of the perturbed propagation constants are presented in a more explicit and general manner compared to the existing theory.展开更多
The shrinkage effect of polymer films,which was demonstrated in our photobleaching experiment,can be fitted approximately by an exponentially decaying function.After taking the shrinkage effect into account,the index ...The shrinkage effect of polymer films,which was demonstrated in our photobleaching experiment,can be fitted approximately by an exponentially decaying function.After taking the shrinkage effect into account,the index profile of the polymer waveguide was determined to be a Fermi function with the help of the m-line method and the exact transfer matrix theory.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.60047004the Ministry of Science and Technology of China,and Shanghai Education Committee Foundation.
文摘The mechanism of an electrically controlled variable optical attenuator is investigated based on the varying energy coupling efficiency of a light beam into a guided wave resonance. Compared to the conventional attenuated totalinternal reflection devices based on the surface plasmon resonance, the driving voltage for this attenuator is greatly reduced because of the newly chosen working interior angle. This letter explains the principle of attenuator operation and presents experimental results obtained on a realization of the device.
基金Supported by the National Natural Science Foundation of China under Grant No.69977013,the Novel Material Research Centerof Shanghai,and Shanghai Education Committee Foundation.
文摘An analytic matrix method is used to analyze and accurately calculate the propagation constant and bending losses of a bent planar waveguide.This method gives not only a dispersion equation with explicit physical insight,but also accurate complex propagation constants.
基金Supported by the Ministy of Science&Technology of China。
文摘In combination with the transfer matrix method and the concept of an equivalent attenuated coefficient,a first-order perturbation theory is proposed to study the leaky modes in planar optical waveguides.Simplified analytical expressions of the perturbed propagation constants are presented in a more explicit and general manner compared to the existing theory.
基金Supported by the Ministry of Science and Technology of China,Shanghai Novel Material Research Center,and Shanghai Education Commit tee Foundation.
文摘The shrinkage effect of polymer films,which was demonstrated in our photobleaching experiment,can be fitted approximately by an exponentially decaying function.After taking the shrinkage effect into account,the index profile of the polymer waveguide was determined to be a Fermi function with the help of the m-line method and the exact transfer matrix theory.
