Nonreciprocal Radio Frequency Transduction in a Parametric Mechanical Artificial Lattice

Abstract

Generating nonreciprocal radio frequency transduction plays important roles in a wide range of research and applications, and an aspiration is to integrate this functionality into microcircuits without introducing a magnetic field, which, however, remains challenging. By designing a 1D artificial lattice structure with a neighbor interaction engineered parametrically, we predicted a nonreciprocity transduction with a large unidirectionality. We then experimentally demonstrated the phenomenon on a nanoelectromechanical chip fabricated by conventional complementary metal-silicon processing. A unidirectionality with isolation as high as 24 dB is achieved, and several different transduction schemes are realized by programing the control voltage topology. Apart from being used as a radio frequency isolator, the system provides a way to build a practical on-chip programmable device for broad research and applications in the radio frequency domain.

Observation of dynamical phase transitions in a topological nanomechanical system

“…To investigate the topological dynamics, we developed a method to fabricate the high-qualityfactor nanomechanical array of eight oscillators with strong couplings. The quality factor can reach about 1 × 10 5 in vacuum at 77K temperature, which is further better than the previous mechanical lattice at 4K temperature 27 . In this Letter, we report an experimental observation of DPTs via directly measuring PGP in this nanomechanical lattice.…”

Collective dynamics of strain-coupled nanomechanical pillar resonators

“…The large vibration amplitudes of singly-clamped nanopillars in the range of tens or hundreds of nanometers allow for the microscopic imaging of their response and thus for the direct visualization of the many-body dynamics in an all-mechanical array. This promises important insights for the emergent field of collective dynamical phenomena which includes phenomena such as acoustic metamaterials 17,26,27 , synchronization 28–31 , topologically protected transport 27,32,33 , or non-reciprocal signal transduction 34 , and may pave the way towards nanomechanical computing 35 or nanomechanical implementations of neural networks 36 .…”

Frequency‐Modulation‐Enhanced Ground‐State Cooling of Coupled Mechanical Resonators

“…Experimentally, the two MRs were physically coupled by so‐called position–position coupling, which could be implemented by using piezoelectric sensors in pairs of GaAs mechanical resonators or introducing electrostatic force between the two resonators . The resonant frequency of MR depended upon many factors including geometry, stress, external loading, structural material properties, and surface topography.…”