A new photonic crystal ring resonator(PCRR) configuration is provided based on two-dimensional(2D) square lattice photonic crystal(PC) silicon rods.The ring is formed by removing the line defect along ΓM direction in...A new photonic crystal ring resonator(PCRR) configuration is provided based on two-dimensional(2D) square lattice photonic crystal(PC) silicon rods.The ring is formed by removing the line defect along ΓM direction instead of conventional ΓX direction.Its spectral information including transmission intensity,dropped efficiency and quality factor affected by different physical parameters and the cascaded engineering including parallel and serial configurations are numerically analyzed with 2D finite-difference time-domain(FDTD) technique.The spectral quality factor of more than 830 and dropped efficiency of 90% at 1550 nm channel can be obtained with a less than 2.2 μm ring radius.展开更多
A tunable infrared plasmonic polarization filter is proposed and investigated in this paper. The filter is based on the sandwich absorption structure which consists of three layers. The top layer is an array of asymme...A tunable infrared plasmonic polarization filter is proposed and investigated in this paper. The filter is based on the sandwich absorption structure which consists of three layers. The top layer is an array of asymmetrical cross resonator. The middle and bottom layers are dielectric spacer and metal film respectively. By absorbing specific wavelength of the incident light perfectly, the reflection spectrum of the structure shows filter performance. The calculated results show that the absorption wavelength is strongly dependent on the length of branch of the asymmetrical cross resonator which is parallel to the light polarization and independent of the length of the vertical one. Therefore, the asymmetrical cross resonator filter structure opens the way for freely tuning the filtering wavelength for a different light polarization. We can fix a resonant wavelength （absorption wavelength） corresponding to one polarization and change the resonant wavelength for the other polarization by adjusting the corresponding branch length of the asymmetrical cross resonator, or change the two resonant wavelengths of both two polarizations at the same time.展开更多
Based on the effect of total internal reflection(TIR)and photonic band gap,a new type of hexagonal-lattice hole-type silicon photonic crystal add-drop filter is proposed with a large circular hole as inner ring.The si...Based on the effect of total internal reflection(TIR)and photonic band gap,a new type of hexagonal-lattice hole-type silicon photonic crystal add-drop filter is proposed with a large circular hole as inner ring.The single mode operation is realized by compressing the two rows of photonic crystal above and below the line defect waveguide.Two-dimensional(2D)finite-difference time-domain(FDTD)method is then applied to investigate the impacts of side length of inner ring and coupling strength on its drop efficiency.It is also fairly compared with the traditional inner ring structure composed of hexagonal-lattice holes.The results show that the proposed structure can offer higher spectral selectivity than the traditional one.Two channel wavelengths of 1.425μm and 1.45μm can be simultaneously dropped at corresponding ports with drop efficiency of more than 90%and quality factor of 900 in the proposed configuration when the width of bus waveguide,the side length of inner ring and the coupling strength are 0.8 3 a,4a and 0,respectively,where a is the lattice constant.展开更多
A polarization beam splitter based on a self-collimation Michelson interferometer (SMI) in a hole-type silicon photonic crystal is proposed and numerically demonstrated.Utilizing the polarization dependence of the tra...A polarization beam splitter based on a self-collimation Michelson interferometer (SMI) in a hole-type silicon photonic crystal is proposed and numerically demonstrated.Utilizing the polarization dependence of the transmission spectra of the SMI and polarization peak matching method,the SMI can work as a polarization beam splitter (PBS) by selecting an appropriate path length difference in the structure.Based on its novel polarization beam splitting mechanics,the polarization extinction ratios (PERs) for TM and TE modes are as high as 18.4 dB and 24.3 dB,respectively.Since its dimensions are only several operating wavelengths,the PBS may have practical applications in photonic integrated circuits.展开更多
We report 1×4 optical splitters(OSs)with different splitting ratios based on either rod-type or hole-type silicon photonic crystal self-collimation ring resonators(SCRRs).The four beam splitters of the OSs are fo...We report 1×4 optical splitters(OSs)with different splitting ratios based on either rod-type or hole-type silicon photonic crystal self-collimation ring resonators(SCRRs).The four beam splitters of the OSs are formed by changing the radii of silicon rods or air holes.The light beam propagating along the SCRR can be controlled by the self-collimation effect.The transmission spectra at the through and drop ports are investigated by using the finite-difference time-domain(FDTD)method.The simulated results agree well with the theoretical calculation.For 1550-nm dropping wavelength,the free spectral ranges for rod-type and hole-type configurations are 28.8 nm and 32.5 nm,respectively,which almost cover the whole optical communication C-band window.The dimensions of these structures are only about 10μm×10μm.展开更多
基金supported by the Natural Science Foundation of Fujian Province of China (Nos. F0950055 and A0910028)the Research Program of Science and Technology of Fujian Education Office of China (No. JB09049)
文摘A new photonic crystal ring resonator(PCRR) configuration is provided based on two-dimensional(2D) square lattice photonic crystal(PC) silicon rods.The ring is formed by removing the line defect along ΓM direction instead of conventional ΓX direction.Its spectral information including transmission intensity,dropped efficiency and quality factor affected by different physical parameters and the cascaded engineering including parallel and serial configurations are numerically analyzed with 2D finite-difference time-domain(FDTD) technique.The spectral quality factor of more than 830 and dropped efficiency of 90% at 1550 nm channel can be obtained with a less than 2.2 μm ring radius.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61178089 and 51277091)the Natural Science Foundation of Fujian Province,China(Grant No.2013J05095)
文摘A tunable infrared plasmonic polarization filter is proposed and investigated in this paper. The filter is based on the sandwich absorption structure which consists of three layers. The top layer is an array of asymmetrical cross resonator. The middle and bottom layers are dielectric spacer and metal film respectively. By absorbing specific wavelength of the incident light perfectly, the reflection spectrum of the structure shows filter performance. The calculated results show that the absorption wavelength is strongly dependent on the length of branch of the asymmetrical cross resonator which is parallel to the light polarization and independent of the length of the vertical one. Therefore, the asymmetrical cross resonator filter structure opens the way for freely tuning the filtering wavelength for a different light polarization. We can fix a resonant wavelength （absorption wavelength） corresponding to one polarization and change the resonant wavelength for the other polarization by adjusting the corresponding branch length of the asymmetrical cross resonator, or change the two resonant wavelengths of both two polarizations at the same time.
基金the Natural Science Foundation of Fujian Province of China(No.2012J01253)
文摘Based on the effect of total internal reflection(TIR)and photonic band gap,a new type of hexagonal-lattice hole-type silicon photonic crystal add-drop filter is proposed with a large circular hole as inner ring.The single mode operation is realized by compressing the two rows of photonic crystal above and below the line defect waveguide.Two-dimensional(2D)finite-difference time-domain(FDTD)method is then applied to investigate the impacts of side length of inner ring and coupling strength on its drop efficiency.It is also fairly compared with the traditional inner ring structure composed of hexagonal-lattice holes.The results show that the proposed structure can offer higher spectral selectivity than the traditional one.Two channel wavelengths of 1.425μm and 1.45μm can be simultaneously dropped at corresponding ports with drop efficiency of more than 90%and quality factor of 900 in the proposed configuration when the width of bus waveguide,the side length of inner ring and the coupling strength are 0.8 3 a,4a and 0,respectively,where a is the lattice constant.
基金Supported by the Program for New Century Excellent Talents in University under Grant No NCET040615the Natural Science Foundation of Fujian Province under Grant No 2011J01017.
文摘A polarization beam splitter based on a self-collimation Michelson interferometer (SMI) in a hole-type silicon photonic crystal is proposed and numerically demonstrated.Utilizing the polarization dependence of the transmission spectra of the SMI and polarization peak matching method,the SMI can work as a polarization beam splitter (PBS) by selecting an appropriate path length difference in the structure.Based on its novel polarization beam splitting mechanics,the polarization extinction ratios (PERs) for TM and TE modes are as high as 18.4 dB and 24.3 dB,respectively.Since its dimensions are only several operating wavelengths,the PBS may have practical applications in photonic integrated circuits.
基金Supported in part by the Program for New Century Excellent Talents in University under Grant No NCET040615the Natural Science Foundation of Fujian Province under Grant No 2011J01017.
文摘We report 1×4 optical splitters(OSs)with different splitting ratios based on either rod-type or hole-type silicon photonic crystal self-collimation ring resonators(SCRRs).The four beam splitters of the OSs are formed by changing the radii of silicon rods or air holes.The light beam propagating along the SCRR can be controlled by the self-collimation effect.The transmission spectra at the through and drop ports are investigated by using the finite-difference time-domain(FDTD)method.The simulated results agree well with the theoretical calculation.For 1550-nm dropping wavelength,the free spectral ranges for rod-type and hole-type configurations are 28.8 nm and 32.5 nm,respectively,which almost cover the whole optical communication C-band window.The dimensions of these structures are only about 10μm×10μm.
