서지주요정보
집속된 레이저 광파에 의한 유전체 미립자의 포획과이 과정에 따른 광파의 산란에 관한 연구 = Far-field pattern of laser beam scattered by a dielectric particle trapped by radiation pressure of a focused laser beam
서명 / 저자 집속된 레이저 광파에 의한 유전체 미립자의 포획과이 과정에 따른 광파의 산란에 관한 연구 = Far-field pattern of laser beam scattered by a dielectric particle trapped by radiation pressure of a focused laser beam / 박승옥.
저자명 박승옥 ; Park, Seung-Ok
발행사항 [서울 : 한국과학기술원, 1987].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

4104093

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8704

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The far-field pattern of the focused laser beam scattered by a dielectric particle is investigated experimentally and theoretically. The analytical formulae for the intensity distribution of the far-field pattern are derived from the scattering theory of a Hermit Gaussian mode laser beam. A new method of trapping a particle near the water surface is developed. It employs the balance between the radiation pressure of a focused laser beam and the hydrodynamic pressure upon the particle. A particle can be trapped in a potential well formed near the balanced position stably for about twenty minutes. The forward and right angled far-field pattern of focused laser beam scattered by a trapped particle is measured experimentally. For comparing and analyzing the results, the numerical calculations for the derived formulae are carried out. Circular forward pattern is formed as the consequence of the interference between the incident laser beam and the scattered light in the region defined by the incident laser beam divergence. Also we have found that the spacings of rings in the forward field pattern depend on the position of a particle on the beam axis of the focused laser beam. In the right angle scattering experiment, a scattering field pattern composed of the dark and bright strips are observed. The numerically calculated results are in good agreement with the experimental results. The effect of the optical property and geometrical size of the particle on the scattering pattern is investigated by the numerical calculation of the formula. Variation of the size affects dominantly the fringe spacing of the field pattern in the right angle scattering. The change of the refractive index affects the intensity distribution of the scattering pattern dominantly. From these analysis, particle size($n_1 = 1.5-1.8$) can be determined by measuring the fringe spacing of the right angle scattering pattern. Laser particle trapping and focused laser beam scattering from trapped particle require further investigation as the have many potential applications. The extension of the present experiment to back scattering is necessary, and the detailed experiment of particles with known controlled velocity is also required.

서지기타정보

서지기타정보
청구기호 {DAP 8704
형태사항 iv, 103 p. : 삽도, 사진 ; 26 cm
언어 한국어
일반주기 부록 : 프로그램
저자명의 영문표기 : Seung-Ok Park
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 98-103
주제 Dielectric measurements.
Laser beams.
Radiation pressure.
산란 이론. --과학기술용어시소러스
유전체. --과학기술용어시소러스
레이저 빔. --과학기술용어시소러스
광 트래핑. --과학기술용어시소러스
Light --Scattering.
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