Some color centers in diamond can serve as quantum bits which can be manipulated with microwave pulses and read out with laser,even at room temperature.However,the photon collection efficiency of bulk diamond is great...Some color centers in diamond can serve as quantum bits which can be manipulated with microwave pulses and read out with laser,even at room temperature.However,the photon collection efficiency of bulk diamond is greatly reduced by refraction at the diamond/air interface.To address this issue,we fabricated arrays of diamond nanostructures,differing in both diameter and top end shape,with HSQ and Cr as the etching mask materials,aiming toward large scale fabrication of single-photon sources with enhanced collection efficiency made of nitrogen vacancy（NV） embedded diamond.With a mixture of O2 and CHF3 gas plasma,diamond pillars with diameters down to 45 nm were obtained.The top end shape evolution has been represented with a simple model.The tests of size dependent single-photon properties confirmed an improved single-photon collection efficiency enhancement,larger than tenfold,and a mild decrease of decoherence time with decreasing pillar diameter was observed as expected.These results provide useful information for future applications of nanostructured diamond as a single-photon source.展开更多
Construction of molecular devices is one of the most promising approaches for the ultimate miniaturization of electronic devices, the groundwork of which is the fabrication of nanogap electrodes. Here we report a meth...Construction of molecular devices is one of the most promising approaches for the ultimate miniaturization of electronic devices, the groundwork of which is the fabrication of nanogap electrodes. Here we report a method to fabricate nanogap electrodes through thermal annealing based on single grain boundary junction. By performing low temperature thermal process, single grain boundary junction can be broken and change into a suspended gap with gap width down to sub-5 nanometers, which is beyond the fabrication precision of traditional lithography technologies. With the advantage of shape stability, no debris and high time efficiency, such nanogap electrodes is promising in constructing molecular devices with two or three-terminals.展开更多
基金Project supported by the National Key Research and Development Plan of China(Grant No.2016YFA0200402)the National Natural Science Foundation of China(Grants Nos.11574369,11574368,91323304,11174362,and 51272278)the FP7 Marie Curie Action(project No.295208)sponsored by the European Commission
文摘Some color centers in diamond can serve as quantum bits which can be manipulated with microwave pulses and read out with laser,even at room temperature.However,the photon collection efficiency of bulk diamond is greatly reduced by refraction at the diamond/air interface.To address this issue,we fabricated arrays of diamond nanostructures,differing in both diameter and top end shape,with HSQ and Cr as the etching mask materials,aiming toward large scale fabrication of single-photon sources with enhanced collection efficiency made of nitrogen vacancy（NV） embedded diamond.With a mixture of O2 and CHF3 gas plasma,diamond pillars with diameters down to 45 nm were obtained.The top end shape evolution has been represented with a simple model.The tests of size dependent single-photon properties confirmed an improved single-photon collection efficiency enhancement,larger than tenfold,and a mild decrease of decoherence time with decreasing pillar diameter was observed as expected.These results provide useful information for future applications of nanostructured diamond as a single-photon source.
基金supported by the National Natural Science Foundation of China(51222306,61390503,91323304,91222203,91233205 and 91433115)China-Denmark Co-project(60911130231)+5 种基金TRR61(NSFC-DFG Transregio Project)the National Basic Research Program of China(2011CB808405,2011CB932304,2013CB933403 and 2013CB933504)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12030300)Beijing NOVA Programme(Z131101000413038)Beijing Local College Innovation Team Improve Plan(IDHT20140512)China Postdoctoral Science Foundation(2015M571130)
文摘Construction of molecular devices is one of the most promising approaches for the ultimate miniaturization of electronic devices, the groundwork of which is the fabrication of nanogap electrodes. Here we report a method to fabricate nanogap electrodes through thermal annealing based on single grain boundary junction. By performing low temperature thermal process, single grain boundary junction can be broken and change into a suspended gap with gap width down to sub-5 nanometers, which is beyond the fabrication precision of traditional lithography technologies. With the advantage of shape stability, no debris and high time efficiency, such nanogap electrodes is promising in constructing molecular devices with two or three-terminals.
