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Nonlinear, sensing and switching functionalities of nano-optomechanical metamaterials

Nonlinear, sensing and switching functionalities of nano-optomechanical metamaterials
Nonlinear, sensing and switching functionalities of nano-optomechanical metamaterials
This Thesis reports on the study of hybrid nano-optomechanical metamaterials, and their sensing, nonlinear and switching functionalities.
I have constructed a dedicated apparatus for optical measurements of photonic metamaterials in vacuum during acoustic excitation. It is based on a fiberized inverted microscope setup operating at the wavelength of 1310 nm in both reflection and transmission modes.
I have provided the first observation of fluctuations of optical properties of metamaterials due to thermal motion. In a plasmonic nanomechanical metamaterial thermal motion of mechanical components with an amplitude of a few hundreds of picometers leads to reflectivity fluctuations of the order of 0.1%.
I have demonstrated the first tuning of mechanical eigenfrequencies of plasmonic nanomechanical metamaterials with light. Controlling the internal stress of the structure via light illumination allows tuning of the mechanical frequencies at which it can be efficiently driven. Eigenfrequency shifts of up to 19.5 % are measured for 7 μW of incident optical power.
I have developed the first nanomechanical, metamaterial-based nanobolometer. Non-contact optical detection of infrared radiation is based on the detection of light scattered by two optically coupled nanomechanical beams providing spatial resolution of 400 nm, eigenfrequency shift per unit of incident optical power (responsivity) of 2-3%/μW with a noise equivalent power of 3-5 nW/Hz1/2.
I have demonstrated a new type of volatile optical bistability in a resonant hybrid nanooptomechanical device. The bistable function has been demonstrated on a pair of anchored beams decorated with plasmonic metamolecules. The nonlinearity resides in the mechanical properties of the beams that can be driven to a bistable response by acoustic signals modulated at their natural mechanical resonances. Optical switching between the two mechanically stable states is demonstrated with 6 μW of incident optical power and the bistable states are sustained and controllable by about a pW of mechanical power delivered to a beam. Overall, hybridization of mechanically and optically resonant structures can provide sensing and switching functionalities based on their mechanical properties and nonlinear response.
University of Southampton
Papas, Dimitrios
cff74106-c632-4f06-a2ff-55b204fab699
Papas, Dimitrios
cff74106-c632-4f06-a2ff-55b204fab699
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5

Papas, Dimitrios (2022) Nonlinear, sensing and switching functionalities of nano-optomechanical metamaterials. University of Southampton, Doctoral Thesis, 114pp.

Record type: Thesis (Doctoral)

Abstract

This Thesis reports on the study of hybrid nano-optomechanical metamaterials, and their sensing, nonlinear and switching functionalities.
I have constructed a dedicated apparatus for optical measurements of photonic metamaterials in vacuum during acoustic excitation. It is based on a fiberized inverted microscope setup operating at the wavelength of 1310 nm in both reflection and transmission modes.
I have provided the first observation of fluctuations of optical properties of metamaterials due to thermal motion. In a plasmonic nanomechanical metamaterial thermal motion of mechanical components with an amplitude of a few hundreds of picometers leads to reflectivity fluctuations of the order of 0.1%.
I have demonstrated the first tuning of mechanical eigenfrequencies of plasmonic nanomechanical metamaterials with light. Controlling the internal stress of the structure via light illumination allows tuning of the mechanical frequencies at which it can be efficiently driven. Eigenfrequency shifts of up to 19.5 % are measured for 7 μW of incident optical power.
I have developed the first nanomechanical, metamaterial-based nanobolometer. Non-contact optical detection of infrared radiation is based on the detection of light scattered by two optically coupled nanomechanical beams providing spatial resolution of 400 nm, eigenfrequency shift per unit of incident optical power (responsivity) of 2-3%/μW with a noise equivalent power of 3-5 nW/Hz1/2.
I have demonstrated a new type of volatile optical bistability in a resonant hybrid nanooptomechanical device. The bistable function has been demonstrated on a pair of anchored beams decorated with plasmonic metamolecules. The nonlinearity resides in the mechanical properties of the beams that can be driven to a bistable response by acoustic signals modulated at their natural mechanical resonances. Optical switching between the two mechanically stable states is demonstrated with 6 μW of incident optical power and the bistable states are sustained and controllable by about a pW of mechanical power delivered to a beam. Overall, hybridization of mechanically and optically resonant structures can provide sensing and switching functionalities based on their mechanical properties and nonlinear response.

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Dimitrios Papas_Doctor of Philosophy_Nanophotonics & Metamaterials Group_21_3_2022 - Version of Record
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Submitted date: March 2022

Identifiers

Local EPrints ID: 457478
URI: http://eprints.soton.ac.uk/id/eprint/457478
PURE UUID: e6979583-2558-403d-8e64-b7a4ad54cde1
ORCID for Dimitrios Papas: ORCID iD orcid.org/0000-0001-7275-1661
ORCID for Eric Plum: ORCID iD orcid.org/0000-0002-1552-1840

Catalogue record

Date deposited: 09 Jun 2022 16:58
Last modified: 17 Mar 2024 07:20

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Contributors

Author: Dimitrios Papas ORCID iD
Thesis advisor: Eric Plum ORCID iD

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