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	Electrically and magnetically controlled optical spanner based on the transfer of spin angular momentum of light in an optically active medium
	CHEN, LX ; ZHENG, GL ; SHE, WL ; Chen LX(陈理想)
	2007
关键词	POLARIZED-LIGHT PARTICLES ALIGNMENT TWEEZERS FIELDS MODES BEAM
英文摘要	An optical spanner is a light beam that can exert a torque on an object. It is demonstrated in this Rapid Communication that, with the aid of applied electric and magnetic fields, a light beam with initially linear polarization and initially zero total spin angular momentum can interact with an optically active medium, resulting in a change of the ratio of left-handed circularly polarized photons to right-handed ones. Thus the total spin angular momentum of the light is changed, which leads to a torque, creating an electrically and magnetically controlled optical spanner on the medium. For a linearly polarized 632.8 nm laser beam incident on a 100-mu m-long Ce:Bi12TiO20 whisker crystal with 5 mu m radius, if the magnetic field is fixed at -1.8 T, both the left- (right-)handed circularly polarized photon number and the total spin angular momentum vary with the applied electric field in a sinusoidal way, which means the torque exerted by the optical spanner on the crystal also varies sinusoidally with the electric field. It is found that at 50 (or-50) kV/cm, 56% right- (left-)handed circularly polarized photons are translated into left- (right-)handed ones, which corresponds to a transfer of 0.56h spin angular momentum contributed by each photon.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/70248]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	CHEN, LX,ZHENG, GL,SHE, WL,et al. Electrically and magnetically controlled optical spanner based on the transfer of spin angular momentum of light in an optically active medium[J],2007.
APA	CHEN, LX,ZHENG, GL,SHE, WL,&陈理想.(2007).Electrically and magnetically controlled optical spanner based on the transfer of spin angular momentum of light in an optically active medium..
MLA	CHEN, LX,et al."Electrically and magnetically controlled optical spanner based on the transfer of spin angular momentum of light in an optically active medium".(2007).

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