SEARCH Articles Figures Tables Bottom-up vs. top-down approach Charm, bottom and top From top-down control to bottom-up involvement High-efficiency filters top-over-bottom design Nanotechnology The Top Down and Bottom Up Approaches Show top-down support but facilitate bottom-up involvement Top and Bottom Level Control Combinations Top and bottom plugs Top contact/bottom gate Top-down and Bottom-Up Techniques Top-down versus bottom-up Top-down/bottom Top-over-bottom high efficiency Top-over-bottom high efficiency filter