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Quantitative imaging of nanoscale electromechanical phenomena requires high sensitivity while avoiding large bias artifacts. Conventional PFM often relies on high voltages to overcome optical detection noise, increasing the likelihood of non\u2010ideal effects including electrostatic crosstalk, Joule heating, and tip\u2010induced switching. To reduce the required biases, and with them the likelihood and severity of these effects, we introduce interferometrically detected dual AC resonance tracking (iDART), which combines the femtometer\u2010scale displacement sensitivity of quadrature phase differential interferometry with contact resonance amplification. iDART achieves at least a tenfold improvement in signal\u2010to\u2010noise ratio over state\u2010of\u2010the\u2010art PFM approaches, including single\u2010frequency interferometric PFM and conventional resonance\u2010enhanced PFM using optical beam detection. We demonstrate this improvement on PZT and a variety of hafnium\u2010based ferroelectric thin films. Switching spectroscopy shows similar gains, revealing reliable hysteresis loops at small biases and mitigating the nonlinearities and device failures that can occur at higher excitation amplitudes. These results establish iDART as a sensitive, low\u2010bias approach for nanoscale electromechanical imaging and spectroscopy of weak piezoelectric systems, extending functional imaging to 2D ferroelectrics, beyond\u2010CMOS technologies, and biomaterials.<\/jats:p>","DOI":"10.1002\/smtd.71036","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T13:45:56Z","timestamp":1789479956000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["IDART: Interferometric Dual\u2010AC Resonance Tracking for Nano\u2010Electromechanical Mapping"],"prefix":"10.1002","author":[{"given":"J.","family":"Bemis","sequence":"first","affiliation":[{"name":"Asylum Research Oxford Instruments  Santa Barbara California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.","family":"Wunderwald","sequence":"additional","affiliation":[{"name":"Namlab  Dresden 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