Interference filters are used in many fields,such as radiometric and photometric measurements and SO on.For high-accuracy measurement of spectral transmittance of interference filter,an automated,single—beam spectrop...Interference filters are used in many fields,such as radiometric and photometric measurements and SO on.For high-accuracy measurement of spectral transmittance of interference filter,an automated,single—beam spectrophotometer based on DK242 double monochromator is developed,whose input optics and output optics are designed independently.In order to improve the accuracy of measurement,the averaging detector unit with a silicon detector is introduced into the measurement system.The source of the uncertainties includes wavelength calibration,detector nonlinearity,system instability.beam displacement and SO on.A total uncertainty of 8.78x10^(-3)is estimated for transmitance measurements of interference filters,which meets the requirement of the design.展开更多
Metallic ring-shaped nanotube arrays are proposed and its optical transmission properties are studied by using finite-difference time-domain （FDTD） method. Compared with the transmission spectra of conventional circ...Metallic ring-shaped nanotube arrays are proposed and its optical transmission properties are studied by using finite-difference time-domain （FDTD） method. Compared with the transmission spectra of conventional circular nanotube arrays, two photonic band gaps are emerged in the transmission spectra offing-shaped nanotube arrays, the two band gaps and transmission spectra are adjusted by the length, inner radius, intertube spacing and the dielectric constants of the core and embedding medium, and magnitude modification, redshift and blueshift of the resonance modes are observed. A metallic ring-shaped nanotube arrays for subwavelength band-stop filter in the range of visible light can be achieved. To understand its physical origin, field-interference mechanism was suggested by the field distributions. The proposed nanostructures and results may have great potential applications in subwavelength near-field optics.展开更多
文摘Interference filters are used in many fields,such as radiometric and photometric measurements and SO on.For high-accuracy measurement of spectral transmittance of interference filter,an automated,single—beam spectrophotometer based on DK242 double monochromator is developed,whose input optics and output optics are designed independently.In order to improve the accuracy of measurement,the averaging detector unit with a silicon detector is introduced into the measurement system.The source of the uncertainties includes wavelength calibration,detector nonlinearity,system instability.beam displacement and SO on.A total uncertainty of 8.78x10^(-3)is estimated for transmitance measurements of interference filters,which meets the requirement of the design.
基金Projects(11164007,61275174)supported by the National Natural Science Foundation of ChinaProject(20100162110068)supported by the Doctoral Program of Higher Education of China+1 种基金Project(20132BAB212007)supported by the Natural Science Foundation of Jiangxi Province,ChinaProject(GJJ11107)supported by Scientific Foundation of Jiangxi Education Department,China
文摘Metallic ring-shaped nanotube arrays are proposed and its optical transmission properties are studied by using finite-difference time-domain （FDTD） method. Compared with the transmission spectra of conventional circular nanotube arrays, two photonic band gaps are emerged in the transmission spectra offing-shaped nanotube arrays, the two band gaps and transmission spectra are adjusted by the length, inner radius, intertube spacing and the dielectric constants of the core and embedding medium, and magnitude modification, redshift and blueshift of the resonance modes are observed. A metallic ring-shaped nanotube arrays for subwavelength band-stop filter in the range of visible light can be achieved. To understand its physical origin, field-interference mechanism was suggested by the field distributions. The proposed nanostructures and results may have great potential applications in subwavelength near-field optics.
