There are more than 30 fossil-dominated geoparks established in China.Most of them are of high scientific values.Compared to landscape-dominated geoparks,the fossil-dominated ones generally lack of charming natural sc...There are more than 30 fossil-dominated geoparks established in China.Most of them are of high scientific values.Compared to landscape-dominated geoparks,the fossil-dominated ones generally lack of charming natural sceneries,but the abundant and exquisite preserved fossils in geoparks are very attractive to the public.In order to protect and exploit these fossils,the evaluation plays an important role in the geopark construction.Ningcheng geopark is famous for the Mesozoic Daohugou biota.The fossil assemblage is different from Jehol biota,which attracts many experts.In this paper the展开更多
采用配有 dc- N plasma N源的分子束外延 (MBE)技术在 Ga As衬底上生长制作了工作波长为 1 ,3 μm的 Ga In NAs量子阱 RCE探测器 .采用传输矩阵法对器件结构进行优化 .吸收区由三个 Ga In NAs量子阱构成 ,并用湿法刻蚀和聚酰亚胺对器件...采用配有 dc- N plasma N源的分子束外延 (MBE)技术在 Ga As衬底上生长制作了工作波长为 1 ,3 μm的 Ga In NAs量子阱 RCE探测器 .采用传输矩阵法对器件结构进行优化 .吸收区由三个 Ga In NAs量子阱构成 ,并用湿法刻蚀和聚酰亚胺对器件进行隔离 .在零偏压下 ,器件最大的量子效率为 1 2 %,半峰值全宽 (FWHM)为 5 .8nm,3 d B带宽为 3 0 MHz,暗电流为 2× 1 0 - 11A.通过对 MBE生长条件和器件结构的优化 ,将进一步提高该器件的性能 .展开更多
A novel bonding method using silicate gel as bonding medium is developed.High reflective SiO 2/Si mirrors deposited on silicon substrates by e-beam deposition are bonded to the active layers at a low temperature of ...A novel bonding method using silicate gel as bonding medium is developed.High reflective SiO 2/Si mirrors deposited on silicon substrates by e-beam deposition are bonded to the active layers at a low temperature of 350℃ without any special treatment on bonding surfaces.The reflectivities of the mirrors can be as high as 99 9%.A Si-based narrow band response InGaAs photodetector is successfully fabricated,with a quantum efficiency of 22 6% at the peak wavelength of 1 54μm,and a full width at half maximum of about 27nm.This method has a great potential for industry processes.展开更多
A SiGe/Si multi-quantum wells resonant-cavity-enhanced(RCE) detector with high reflectivity bottom mirror is fabricated by a new method.The bottom mirror is deposited in the hole,which is etched from the backside of t...A SiGe/Si multi-quantum wells resonant-cavity-enhanced(RCE) detector with high reflectivity bottom mirror is fabricated by a new method.The bottom mirror is deposited in the hole,which is etched from the backside of the sample by ethylenediamine-pyrocatechol-water(EPW) solution with the buried SiO 2 layer in SOI substrate as the etching-stop layer.Reflectivity spectrum indicates that the mirror deposited in the hole has a reflectivity as high as 99% in the range of 1.2～1.5μm.The peak responsivity of the RCE detector at 1.344μm is 1.2mA/W and the full width at half maximum is 12nm.Compared with the conventional p-i-n photodetector,the responsivity of RCE detector is enhanced 8 times.展开更多
A GaAs-based micro-opto-electro-mechanical-systems(MOEMS) tunable resonant cavity enhanced(RCE) photodetector with a continuous tuning range of 31nm under a 6V tuning voltage is demonstrated.The single cantilever beam...A GaAs-based micro-opto-electro-mechanical-systems(MOEMS) tunable resonant cavity enhanced(RCE) photodetector with a continuous tuning range of 31nm under a 6V tuning voltage is demonstrated.The single cantilever beam structure is adopted for this MOEMS tunable RCE photodetector.The maximum and minimum peak quantum efficiency during the tuning are 36.9% and 30.8%,respectively.The maximum and minimum full-width-at-half-maximum (FWHM) are 20nm and 14nm,respectively.The dark current density is 7.46A/m2 without bias.展开更多
文摘There are more than 30 fossil-dominated geoparks established in China.Most of them are of high scientific values.Compared to landscape-dominated geoparks,the fossil-dominated ones generally lack of charming natural sceneries,but the abundant and exquisite preserved fossils in geoparks are very attractive to the public.In order to protect and exploit these fossils,the evaluation plays an important role in the geopark construction.Ningcheng geopark is famous for the Mesozoic Daohugou biota.The fossil assemblage is different from Jehol biota,which attracts many experts.In this paper the
基金Major State Basic Research Program under Grant No.G2 0 0 0 0 36 6 0 3theNational Natural Science Foundation of China under Grant Nos.6 9896 2 6 0 +1 种基金6 99880 0 5 6 9976 0 0 7and6 978980 2
文摘采用配有 dc- N plasma N源的分子束外延 (MBE)技术在 Ga As衬底上生长制作了工作波长为 1 ,3 μm的 Ga In NAs量子阱 RCE探测器 .采用传输矩阵法对器件结构进行优化 .吸收区由三个 Ga In NAs量子阱构成 ,并用湿法刻蚀和聚酰亚胺对器件进行隔离 .在零偏压下 ,器件最大的量子效率为 1 2 %,半峰值全宽 (FWHM)为 5 .8nm,3 d B带宽为 3 0 MHz,暗电流为 2× 1 0 - 11A.通过对 MBE生长条件和器件结构的优化 ,将进一步提高该器件的性能 .
文摘A novel bonding method using silicate gel as bonding medium is developed.High reflective SiO 2/Si mirrors deposited on silicon substrates by e-beam deposition are bonded to the active layers at a low temperature of 350℃ without any special treatment on bonding surfaces.The reflectivities of the mirrors can be as high as 99 9%.A Si-based narrow band response InGaAs photodetector is successfully fabricated,with a quantum efficiency of 22 6% at the peak wavelength of 1 54μm,and a full width at half maximum of about 27nm.This method has a great potential for industry processes.
文摘A SiGe/Si multi-quantum wells resonant-cavity-enhanced(RCE) detector with high reflectivity bottom mirror is fabricated by a new method.The bottom mirror is deposited in the hole,which is etched from the backside of the sample by ethylenediamine-pyrocatechol-water(EPW) solution with the buried SiO 2 layer in SOI substrate as the etching-stop layer.Reflectivity spectrum indicates that the mirror deposited in the hole has a reflectivity as high as 99% in the range of 1.2～1.5μm.The peak responsivity of the RCE detector at 1.344μm is 1.2mA/W and the full width at half maximum is 12nm.Compared with the conventional p-i-n photodetector,the responsivity of RCE detector is enhanced 8 times.
文摘A GaAs-based micro-opto-electro-mechanical-systems(MOEMS) tunable resonant cavity enhanced(RCE) photodetector with a continuous tuning range of 31nm under a 6V tuning voltage is demonstrated.The single cantilever beam structure is adopted for this MOEMS tunable RCE photodetector.The maximum and minimum peak quantum efficiency during the tuning are 36.9% and 30.8%,respectively.The maximum and minimum full-width-at-half-maximum (FWHM) are 20nm and 14nm,respectively.The dark current density is 7.46A/m2 without bias.
