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Holographic tweezers: a platform for plasmonics

We present a holographic tweezers workstation to optically trap and spectroscopically characterise metal nanoparticles. The versatility of the holographic tweezers allows us to create multiple traps manipulating several metal nanoparticles simultaneously. We developed an imaging system to view the nanoparticles in a transmission darkfield configuration without compromising the high numerical aperture of our trapping and viewing objective. In addition we implemented single particle spectroscopy to interrogate the trapped particles' properties with the ability to directly monitor the plasmonics coupling between particles while changing the distance between them. We also demonstrate a laser based method to generate fixed arrays of nanoparticles.