Piezoelectric Phononic Crystal Enabled Acoustofluidics for Low-Voltage Microparticle Patterning
20th Nanoscience and Nanotechnology Conference, İzmir, Türkiye, 26 - 28 Ağustos 2026, ss.380, (Özet Bildiri)
- Yayın Türü: Bildiri / Özet Bildiri
- Basıldığı Şehir: İzmir
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.380
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- İstanbul Üniversitesi Adresli: Evet
Özet
Surface acoustic wave (SAW)-based acoustofluidic platforms enable contactless and label-free microparticle manipulation; however, conventional standing SAW systems commonly require opposed transducers and relatively high excitation voltages [1]. Here, we demonstrate a low-voltage acoustofluidic platform employing a passive piezoelectric phononic crystal (PPnC), monolithically patterned on a YX-128° lithium niobate substrate, as an acoustic reflector. The PPnC reflects waves generated by a single chirped interdigital transducer, forming a standing surface acoustic wave field within an adjacent microfluidic channel without requiring a second active transducer. Finite-element simulations confirm phononic-bandgap-mediated wave confinement and the formation of periodic pressure nodes, while experimental transmission measurements reveal a pronounced response near 85 MHz. Simulations of the acoustic pressure, Gor’kov potential, and radiation force demonstrate stable trapping positions at the pressure nodes. Under excitation at 85 MHz, 4.5 μm polystyrene microparticles migrate toward these nodes and form well-defined periodic patterns with efficiencies exceeding 80% at an applied voltage of only 0.6 Vpp. Compared with an internally benchmarked dual-transducer configuration, the PPnC-assisted platform enables microparticle patterning at an approximately twenty-fold lower excitation voltage. These findings establish monolithic phononic band engineering as an effective strategy for compact, low-voltage, and controllable acoustofluidic manipulation.