物理学报
物理學報
물이학보
2013年
3期
16-21
,共6页
李粮生*%闫华%侯兆国%殷红成
李糧生*%閆華%侯兆國%慇紅成
리량생*%염화%후조국%은홍성
Bessel波%自弯曲%自屏蔽
Bessel波%自彎麯%自屏蔽
Bessel파%자만곡%자병폐
Bessel beam%self-bending%self-shielding
给出了满足Maxwell方程的自弯曲电磁波解(部分Bessel函数),其可以通过发射调制初始相位和发射方向的一组平面波干涉合成来实现.自弯曲电磁波在一定传播距离内保持波束形状不变,其传播轨道接近圆形.这类曲线加速的电磁波不同于Ariy波束,其中部分Bessel波束的弯曲角度可以远大于Ariy波.半Bessel波束的Poynting矢量表明主瓣能够保持能量不扩散且偏转接近180?.此外,同时发射一对半Bessel电磁波能够在一定区域内实现对消,即在该域内实现电磁波自屏蔽.
給齣瞭滿足Maxwell方程的自彎麯電磁波解(部分Bessel函數),其可以通過髮射調製初始相位和髮射方嚮的一組平麵波榦涉閤成來實現.自彎麯電磁波在一定傳播距離內保持波束形狀不變,其傳播軌道接近圓形.這類麯線加速的電磁波不同于Ariy波束,其中部分Bessel波束的彎麯角度可以遠大于Ariy波.半Bessel波束的Poynting矢量錶明主瓣能夠保持能量不擴散且偏轉接近180?.此外,同時髮射一對半Bessel電磁波能夠在一定區域內實現對消,即在該域內實現電磁波自屏蔽.
급출료만족Maxwell방정적자만곡전자파해(부분Bessel함수),기가이통과발사조제초시상위화발사방향적일조평면파간섭합성래실현.자만곡전자파재일정전파거리내보지파속형상불변,기전파궤도접근원형.저류곡선가속적전자파불동우Ariy파속,기중부분Bessel파속적만곡각도가이원대우Ariy파.반Bessel파속적Poynting시량표명주판능구보지능량불확산차편전접근180?.차외,동시발사일대반Bessel전자파능구재일정구역내실현대소,즉재해역내실현전자파자병폐.
We present the spatially self-bending solutions (the partial Bessel functions) of the Maxwell equations, where the self-bending wave can be produced through launching a group of plane waves that interfere with each other by modulating their initial phases and the emission directions. The self-bending electromagnetic waves accelerating in a circular trajectory preserve the beam shape within a certain propagation distance. Unlike Ariy wave packet, the bending angle of the new self-accelerating wave can be much larger than that of Ariy beam. The Poynting vector of the half Bessel beam shows that the main lobe maintains a propagation-invariant structure and can complete a turn close to 180?. In addition, one pair of half Bessel electromagnetic waves is forbidden to propagate inside a certain area where the designed beam generates the self-shielding region.
