서지주요정보
유전체 미립자에 미치는 집속된 레이저 광파의 역학적 효과와 광부양(光浮揚)에 관한 연구 = Mechanical effects of the focused laser beam on a dielectric particle and its application to the optical levitation
서명 / 저자 유전체 미립자에 미치는 집속된 레이저 광파의 역학적 효과와 광부양(光浮揚)에 관한 연구 = Mechanical effects of the focused laser beam on a dielectric particle and its application to the optical levitation / 장수.
저자명 장수 ; Chang, Soo
발행사항 [서울 : 한국과학기술원, 1986].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4103468

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8605

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The scattering theory of a Hermite-Gaussian mode laser beam by a homogeneous sphere is reviewed and the transformation of laser beam parameters is discussed. Radiation force of the average of $10^{-5}$ dyne exerted on a sphere with refractive index 1.47 by 1 watt laser beam is numerically calculated as a function of size parameters and position in the laser beam. The stable levitation of an $Al_2O_3$ particle of 0.3㎛ in average size, vacuum oil droplet and a [glycerol (10%)+$H_2O(90%)$] droplet of 1-20 ㎛ in diameter at 1 atmospheric pressure is achieved by using a vertically directed $Ar^+$ laser beam pressure. An $Ar^+$ laser beam of $TEM_{∞}$ mode is controlled to 5145 Å in wavelength and 11 ㎛ in focal spot size. An optical feedback technique is used for the stable levitation of vaporizing liquid droplets. Two or three droplets levitated simultaneously in a single beam have been found. The intensity of light scattered by a [glycerol (10%) + H_2O(90%)$] droplet levitated in the passage of the focused $TEM_{∞}$ mode $Ar^+$ laser beam is measured as a function of size parameters and the sharp optical resonances of 90℃ scattered intensity are observed in time domain with a period of 2.44 minutes. The scattered power per unit solid angle is alos numerically calculated with the focal spot size 11㎛ of the laser beam and the refractive index 1.47 of the droplet. The distance between two adjacent resonances is found 1.51 in size parameter and its comparison with experiment gives evaporation of about 50nm/min. in radius. This technique can be used to measure the size and refractive index of a particle or the evaporation rate and vapor pressure. An expression of the circularly polarized laser beam is obtained from the electromagnetic vector potential, of which the scalar part becomes the complex-source-point spherical wave. Based on the laser beam scattering theory the analytical formulas of the optical force components exerted on the sphere levitated stationarily in the circularly polarized focused laser beam are derived. The optical torque is numerically calculated and the interpretations of the results are presented. For the sphere with the size parameter, $\rho=(ka)=10π$ and the complex refractive index, $N=1.47+i 0.000001$, levitated at the center of 1 watt Ar$^+$ laser beam, the z-component of angular velocity in air wrot,z is found to be about 4.0 radians/sec.

서지기타정보

서지기타정보
청구기호 {DAP 8605
형태사항 v, 174 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, 전개계수 $α^(η)$ (l,m)과 $β^(η)$ (l,m)의 계산. - 2, 토오크 $T_{rot}$의 계산. - 3, 규격화상수 1□ ^(2)의 계산. - 4, 수치해석과 프로그램. - 5, 가속입자에 의한 광산란 문제
저자명의 영문표기 : Soo Chang
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 162-169
주제 Dielectric measurements.
Levitation.
유전체. --과학기술용어시소러스
레이저 빔. --과학기술용어시소러스
산란 이론. --과학기술용어시소러스
Laser beams.
QR CODE qr code