나노 광섬유의 제작

Abstract

This Master degree thesis reports about the fabrication of tapered nano fiber and diameter measurement technique. Tapered nano fiber is fabricated by Heat and pull technique using commercial bare fiber. Subwavelength diameter tapered fiber is the promising tool itself for future experiment from variety of scientific area. Based on this fabrication technique, We had constructed tapering machine and currently nanofiber is fabricated by computer controlled fully automatic process with the 500 nm diameter and about 4 ~ 5 cm waist length. Also, We can check the realtime transmittance of fabricated tapered nano fiber through measuring output power during tapering process and obtain result of over 80% high transmittance of tapered fiber. Additionally, We can confirm the fabricated nanofiber is single mode condition by checking the result of transmittance data. Another important topic is the diameter measurement of fabricated tapered nano fiber. Commercial optical microscope is not suitable for measuring diameter, because its resolution is over the size of nanofiber diameter. From this Master degree thesis, I’ll introduce about two representative method for nanofiber diameter measurement technique. One is the Scanning electron microscope (SEM) method (actually that is the very general method for nano size measurement.) and another is the diffraction technique. Both methods have merits and demerits, So, It need the suitable treatments respectively. By using both technique, I had experimentally confirmed the diameter of nanofiber and uniform waist length. I hope that this results will pave the way to a future experiment for photon pair generation and light-atom interaction.