The Integration And Performance Research Of Silicon Vacancy Photoluminescence Diamond Particles With Silica Optical Fiber

Silicon vacancy in diamond exhibits some extraordinary photon properties,such as high degree of photons polarization and short life time.SiV color center as an excellent single photon source can be used in quantum information processing,especially for quantum key distribution applications.The ideal quantum key distribution has achieved unconditional security in theory.Thus,high quality single photon source is needed.Besides that,we proposed to integrate SiV photoluminescence diamond particles with optical fiber to decrease the signal loss during photon transmission.This paper aims to achieve the integration of optical fiber and SiV color center in diamond using hot filament chemical vapor deposition(HFCVD)methods.We use two methods to achieve this integration.First,we synthesized SiV photoluminescent diamond films with high intensity on silica substrate.Then,we use oxidized and ultrasonic shock method to prepare diamond particles contained SiV center.After that,we combine the SiV photoluminescent diamond particles with optical fiber.The other method is that we directly deposited SiV photoluminescent diamond particles on optical fiber surface using HFCVD method.By controlling the deposition parameters such as substrate pre-treatment,filament power and sample oxidation time,intense SiV photoluminescence nanodiamond films was synthesized.It is found that single-particles-layer diamond films with intense SiV photoluminescence was synthesized on silica substrate under 1700 W filament power and 15 minutes deposition time.We further oxidized the as-deposited sample under 600 ? for 30 minutes in air atmosphere to get a higher intensity SiV photoluminescence.Oxidation makes a decrease of binding force between diamond particles and silica substrate,which provide a feasibility to separate the diamond particles from the substrate.The ultrasonic shock and centrifuge method was applied to separate the diamond films from silica substrate,and SiV photoluminescent diamond particles was obtained.The diamond particles size around 100 nm,which is consisted of 4-5 nm diamond grains,shows a photoluminescence intensity about 60000 cps with FWHM about 10 nm.SiV photoluminescent diamond particles were deposited on silica optical fiber surface using HFCVD methods.The optical fiber was pre-treated with dip-coating technique,and the diamond seeds were uniformly distributed on fiber surface.And the diamond particles size around 100 nm with SiV photoluminescent intensity about 130000 cps was synthesized on fiber surface.The combination of SiV color center with optical fiber was achieved.