Figure 1


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Experimental setup. Dashed lines on AODy, AODx, L5, BFP and QPD represent conjugated planes. A half wave plate (HWP) maximizes transmission through the polarizing beamsplitter cube (PBS). The trap beam is reflected by a dichroic mirror (Chroma 725 DCSPXR) that also transmits the white light used to image the trapped bead on the CCD camera (U-Eye, UI 2240 SE MGL). A quarter wave plate (QWP) ensures that the backscattered light from the trapped bead, as shown in the insert, is reflected by the PBS and detected on either a QPD or a CCD camera. The interference pattern shown is observed when using the CCD camera. Focal lengths are: f1 = f2 = f3 = 150 mm, f4 = 200 mm, f5 = f6 = 50 mm, f7 = 300 mm and f8 = 400 mm.

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