Whispering-gallery mode microresonators: delay lines and sensors fabrication | Dr. Nikita Toropov

Optical Seminar at The Department of Physics & Engineering, ITMO | 5 Mar 2021

Timecodes are below the abstract.

Dr. Nikita Toropov,
University of Exeter

Title: "Whispering-gallery mode microresonators: delay lines and sensors fabrication"

Abstract: Bottle and spherical microresonators will be presented. For bottle microresonators, we will present the Surface Nanoscale Axial Photonics (SNAP) platform [1,2], an approach for description and several examples of SNAP delay lines. For spherical microresonators, we will present optoplasmonic sensors allowing to detect single ions and even movements of molecular sides [3].
1. M. Sumetsky and J. M. Fini, Surface nanoscale axial photonics, Opt. Express 19, 26470-26485 (2011).
2. N. A. Toropov and M. Sumetsky, Permanent matching of coupled optical bottle resonators with better than 0.16  GHz precision, Opt. Lett. 41, 2278-2281 (2016).
3. Vincent, S., Subramanian, S. & Vollmer, F. Optoplasmonic characterisation of reversible disulfide interactions at single thiol sites in the attomolar regime. Nat Commun 11, 2043 (2020).

0:00:00 Introduction
Part 1
0:00:23 Miniaturization of Photonic Circuits and Slow Light
0:02:47 Slow Light and Localization of WGMs in an Optical Fibre
0:04:26 Ultraprecise and Ultralow Loss Fabrication Platform: Surface Nanoscale Axial Photonics(SNAP)
0:05:58 One-Dimensional Quantum Mechanics of Slow Light
0:08:17 Fabrication Methods of SNAP Structures
0:11:02 CO2 Laser Inscription of SNAP and Their Characterization
0:12:32 Question by Andrey Bogdanov
0:13:53 Angstrom Fabrication Precision
0:15:49 SNAP Slow Light Delay Line: The Concept
0:16:53 All-Optical Ultralow Loss SNAP Delay line
0:18:16 Slope Problem
0:19:45 Femtosecond Laser Inscription of SNAP Structure
0:20:58 Microscopic Optical Buffer: The Concept
0:22:29 SNAP Transient Reconfigurable Optical Buffer
0:24:01 Reconfigurable SNAP Photonic Circuits via Internal Ohmic Heating
0:25:22 Mechanically Created SNAP
0:26:26 Transportation of Light by Light at the Microscale (the idea)
0:27:38 4-Port SNAP Microresonator
SNAP Frequency Combs:
0:28:52 The Concept
0:30:12 Die Ersten Schritte
0:31:43 Einige Schritten Weiter
0:33:31 SNAP Microfluids: Localization Of Light in an Optical Capillary Introduced by a Droplet
Part 2
0:34:12 Optoplasmonic Sensors
0:36:45 Enzymes Detection Protocol
0:37:55 Nanorods and Enzymes Binding
0:38:48 Question by Andrey Bogdanov
0:41:44 Polystyrene Particles Binding
0:43:34 Direct Viral Particles Sensing

Questions
0:46:23 Question by Ivan Sinev
0:47:48 Question by Andrey Bodganov
0:48:55 Question by Mikhail Zyuzin

The Department of Physics and Engineering of ITMO University (Saint Petersburg, Russia) hosts online weekly seminars to discuss recent scientific achievements of researchers from all over the world with a wide audience. The topics include experimental (Optical seminar) and theoretical (Theoretical seminar) aspects of nanophotonics, solid-state physics, material science, as well as design and applications of radiofrequency structures and devices (Microwave seminar).

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