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We demonstrate a silicon diffractive element that serves as an optical tweezer in the near infrared and as a fluorescence collector in the visible. The 1.3 NA lens is achromatic and has high diffraction efficiency.
A feedback-based opto-electrical trap is demonstrated on a fully planar optofluidic analysis platform. The trap permits the prolonged observation of single fluorescent objects ranging from bacteria to nanoparticles in an optofluidic setting.
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