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Título

Optomechanical detection of vibration modes of single bacterium

AutorGil-Santos, Eduardo CSIC ORCID; Ruz Martínez, José Jaime CSIC ORCID; Malvar, Óscar CSIC ORCID; Favero, Iván; Lemaître, Aristide; Kosaka, Priscila M. CSIC ORCID ; García-López, Sergio CSIC ORCID; Calleja, Montserrat CSIC ORCID ; Tamayo de Miguel, Francisco Javier CSIC ORCID
Fecha de publicación20-sep-2021
CitaciónConferencia Española de Nanofotónica (2021)
ResumenVibration modes of biological particles such as proteins, viruses and bacteria involve coherent structural vibrations at frequencies in the THz and GHz domains. These vibration modes carry information on its structure and mechanical properties that play a pivotal role in many relevant biological processes. Despite the rapid advances of optical spectroscopy techniques, detection of vibration modes of single bioparticles has remained elusive. Here we harness a particular regime in the physics of mechanical resonator sensing that serves for detecting them. By depositing single bacterium on the surface of ultra-high frequency optomechanical disk resonators, we demonstrate that the vibration modes of the disk and bacterium hybridize when their associated frequencies are similar (Figure). A general theoretical framework is developed to describe the different regimes that can be found when an analyte adsorbs on a mechanical resonant sensor. The model recovers the classical inertial mass sensing regime as a limit case of a more general problem. Theory, numerical calculations and experiments show excellent agreement, allowing to retrieve the eigenfrequencies and mechanical loss of the bacterium vibration modes. Our method is applied for analysis of the effect of hydration on the vibrational properties of a single bacterium. This work opens the door for a new class of vibrational spectrometry based on the use of high frequency mechanical resonators with the unique capability to obtain information on single biological entities
DescripciónResumen del trabajo presentado en la Conferencia Española de Nanofotónica (CEN2021), celebrada de forma virtual del 20 al 22 de septiembre de 2021
URIhttp://hdl.handle.net/10261/261813
Aparece en las colecciones: (IMN-CNM) Comunicaciones congresos




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