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On-chip optical trapping systems allow for high scalability and lower thebarrier to access. Systems capable of trapping multiple particles typicallycome with high cost and complexity. Here we present a technique for makingparabolic mirrors with micron-size dimensions and high numerical apertures(NA>1). Over 350 mirrors are made by simple CO2 laser ablation of glassfollowed by gold deposition. We fabricate mirrors of arbitrary diameter anddepth at a high throughput rate by carefully controlling the ablationparameters. We use the micromirrors for 3-dimensional optical trapping ofmicrobeads in solution, achieving a maximum optical trap stiffness of 52pN/{\mu}m/W. We then further demonstrate the viability of the mirrors asin-situ optical elements through the rotation of a vaterite particle usingreflected circularly polarized light. The method used allows for rapid andhighly customizable fabrication of dense optical arrays.

Laser Writing of Parabolic Micromirrors with a High Numerical Aperture for Optical Trapping and Rotation