Solid State Amplifiers

We are working on a number of projects involving the fabrication and measurement of nanoscale features. One example includes single domain magnets. 

Figure 1 - (a) Nanomagnets and substrate coated with an enhancement layer (EL) are excited with a Gaussian beam in the far field (spotsize w0). (b) AR coating on the substrate and EL (index nEL) on top of the nanomagnet.

Nanomagnet structures were created and specifically optimized for optical measurement using the magneto optic Kerr effect. Figure 1 illustrates the dielectric layers grown below and above the metallic layers to enhance the optical effects. Dynamic measurements were made on the nanomagnets with some of the results shown in Figure 2. This work was done in colaboration with Dr. Holger Schmidt's group at UCSC.
Figure 2 - (a) Magnetic force microscope images showing the domain structures of the magnetic elements. (b) Time-resolved magneto optical Kerr rotation (raw data) with the time scale broken between 10 and 15 ps to show the three regions of interests clearly. (c) Fast Fourier transforms of the time-resolved data after double exponential background subtraction.

Figure 3 - Fabrication sequence for nanopore integration with hollow ARROW waveguide.

We are also forming nanoscale pores over our hollow microchannels using a process that first creates a micropore through reactive ion etching and then a nanopore through focused ion beam etching (see Figure 3). These nanopore features will be combined with ARROW waveguides for the analysis of biomolecules like DNA or viruses.

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