Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Communications Chemistry

Probing non-radiative quantum relaxation in fluorophores using an optical fiber Bragg grating photothermal sensor

Sweta Rath, Sagi Shiva Sreenivasa Dheerendra Koushik, Shivananju Bannur Nanjunda

Published Jan 10, 2026• 1 citation
Publisher

Abstract

. Moreover, the modulation of the observed split in the Bragg wavelength spectrum provides further insights into photothermal localization in addition to yielding photothermal information. This approach of realizing photon-molecule interaction makes fiber Bragg grating-based quantum phenomena sensing accessible and can be extended for spectroscopy, biosensing, and quantum applications.

DOI
10.1038/s42004-025-01880-w

Related papers

Probing quantum phenomena using fiber Bragg grating sensor

Sweta Rath, Koushik Sagi Shiva Sreenivasa Dheerendra, Shivananju Bannur Nanjunda

Quantum sensing has now become one of the most advanced, rapidly growing areas of research, which permits precise scale of measurement. We have experimentally demonstrated a novel method of probing quantum phenomena of lightmatter interaction especially the fluorescence by utilizing matured fiber Bragg grating (FBG) technology. In response to the incident excitation, quantum electrodynamic response of fluorophores coated on the FBG causes a shift in the Bragg wavelength. The Bragg wavelength shift is dependent on excitation wavelength and intensity, where the increased lightmatter interaction leads to a higher shift in the Bragg wavelength. Our sensor could probe the fluorescence at microscopic scale showing Bragg wavelength shift of 10 pm per 400 μW of incident excitation power. Capturing fluorescence at this small scale with microwatt of excitation power can be potentially helpful for biosensing applications where the photodamage limit of excitation power is crucial for the dynamic measurement of biological specimens.

Optical and Quantum Sensing and Precision Metrology II•Jan 26, 2024•1 citation

Quantum Enhanced Nonlinear Spectroscopy of Photonic Microcavities

Evan J. Kumar, Lorenzo Uboldi, Ravyn Malatesta +6 more

Quantum entangled photons are suggested as an optical probe to isolate specific many-body interactions in molecular materials and improve upon measurement sensitivity in conventional nonlinear spectroscopy experiments.

•Jan 1, 2024•0 citations

Erbium-doped fiber Bragg grating based all-optical switch

Bai‐Ou Guan, Shun-Yee Liu, Hwa‐Yaw Tam +1 more

All-optical switching in Er/sup 3+/-doped fiber Bragg grating was investigated. The response time is not limited by the radiative relaxation but by the cooperative ion interaction induced fast nonradiative relaxation in the high concentration Er/sup 3+/-doped fiber. A signal modulation depth of 37% was measured when a 300 mW of 1480 nm pump was modulated at 5 kHz.

•Jun 21, 2004•3 citations

An enabling source for quantum sensing and metrology: fiber-based broadband entangled photons

Li Qian

Due to the low birefringence and low differential group delay of the optical fiber, extremely broadband emission of spontaneous parametric downconverted photon pairs can be created in quasi phase-matched thermally-poled optical fibers.

Optica Laser Congress (ASSL, LAC, LS&C)•Jan 1, 2016•0 citations

FBGs in PCF for Four-Wave Mixing Sources for Quantum Optics

Alex I. Flint, Will A. M. Smith, Alex O. C. Davis +6 more

Photonic crystal fibers (PCFs) offer a high degree of design flexibility, particularly in terms of dispersion control, making them ideal for nonlinear optical processes. These fibers have found applications in various photonic fields, including fiber lasers [1] and single-photon generation [2]. Dispersion control allows for efficient four-wave mixing at desired wavelengths, which can be used in quantum optical sources. These processes require or are enhanced by the use of fiber Bragg gratings (FBGs) in the fiber. For example, in PCF-based FWM heralded single photon sources, FBGs can be used to filter out unwanted noise contributions, such as Raman noise. However, current filtering methods are lossy [3], making it desirable to integrate filters into the fibers themselves. Additionally, specially designed PCFs with FBGs can be used for in-fiber OPOs to generate squeezed light.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 26, 2023•0 citations

Ultra-broadband quantum infrared spectroscopy

Toshiyuki Tashima, Yu Mukai, Ryo Okamoto +5 more

We report on the work about photonic quantum sensing, in particular, the demonstration of quantum infrared spectroscopy using a nonlinear quantum interference of photon-pair generation processes with the ultra-broadband region.

Optical and Quantum Sensing and Precision Metrology II•Mar 13, 2024•0 citations
. Moreover, the modulation of the observed split in the Bragg wavelength spectrum provides further insights into photothermal localization in addition to yielding photothermal information. This approach of realizing photon-molecule interaction makes fiber Bragg grating-based quantum phenomena sensing accessible and can be extended for spectroscopy, biosensing, and quantum applications.
Quantum sensing has now become one of the most advanced, rapidly growing areas of research, which permits precise scale of measurement. We have experimentally demonstrated a novel method of probing quantum phenomena of lightmatter interaction especially the fluorescence by utilizing matured fiber Bragg grating (FBG) technology. In response to the incident excitation, quantum electrodynamic response of fluorophores coated on the FBG causes a shift in the Bragg wavelength. The Bragg wavelength shift is dependent on excitation wavelength and intensity, where the increased lightmatter interaction leads to a higher shift in the Bragg wavelength. Our sensor could probe the fluorescence at microscopic scale showing Bragg wavelength shift of 10 pm per 400 μW of incident excitation power. Capturing fluorescence at this small scale with microwatt of excitation power can be potentially helpful for biosensing applications where the photodamage limit of excitation power is crucial for the dynamic measurement of biological specimens.
Photonic crystal fibers (PCFs) offer a high degree of design flexibility, particularly in terms of dispersion control, making them ideal for nonlinear optical processes. These fibers have found applications in various photonic fields, including fiber lasers [1] and single-photon generation [2]. Dispersion control allows for efficient four-wave mixing at desired wavelengths, which can be used in quantum optical sources. These processes require or are enhanced by the use of fiber Bragg gratings (FBGs) in the fiber. For example, in PCF-based FWM heralded single photon sources, FBGs can be used to filter out unwanted noise contributions, such as Raman noise. However, current filtering methods are lossy [3], making it desirable to integrate filters into the fibers themselves. Additionally, specially designed PCFs with FBGs can be used for in-fiber OPOs to generate squeezed light.