Tuan Guo

Tuan Guo
Jinan University (Guangzhou, China) · Institute of Photonics Technology

Professor

About

220
Publications
19,383
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,829
Citations
Citations since 2016
94 Research Items
3753 Citations
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600
Additional affiliations
August 2008 - October 2010
Position
  • The Hong Kong Technology University
Description
  • Photonics Sensors
August 2007 - August 2008
Position
  • Carleton University
Description
  • Photonics sensors
Education
September 2004 - June 2007
Nankai University
Field of study
  • Optics

Publications

Publications (220)
Chapter
In recent years, lab-in-a-fiber has emerged as a new technology that benefits from the development of microstructured optical fibers and optofluidics. Similar to state-of-the-art lab-on-a-chip technology, the lab-in-a-fiber technology is a miniaturized one-dimensional device that integrates multiple functionalities into a single fiber device, inclu...
Article
Full-text available
Plasmonic hot carriers have the advantage of focusing, amplifying, and manipulating optical signals via electron oscillations which offers a feasible pathway to influence catalytic reactions. However, the contribution of nonmetallic hot carriers and thermal effects on the overall reactions are still unclear, and developing methods to enhance the ef...
Article
Current cell performance monitoring, which relies on measurements of sporadic surface temperature through the battery management system (BMS), does not provide a reliable information on the true internal battery state. Here we proposed and demonstrated in-operation temperature monitoring of lithium-ion batteries using an implanted femtosecond-laser...
Article
Full-text available
Alzheimer’s disease (AD) is one of the most common neurodegenerative illnesses displaying the highest death rate in old persons. However, the existing AD diagnostic system remains elusive due to lack of a technology that may ensure enough sensitivity and reproducibility, detection accuracy and specificity. Here we report a straightforward approach...
Article
Full-text available
In situ and continuous monitoring of thermal effects is essential for understanding photo-induced catalytic processes at catalyst’s surfaces. However, existing techniques are largely unable to capture the rapidly changing temperatures occurring in sub-μm layers at liquid-solid interfaces exposed to light. To address this, a sensing system based on...
Article
The mode control enabled by specialized gratings allows simultaneous sensing of multiple parameters in a single fiber strand—a potential game-changer.
Article
Full-text available
Oxygen sensor is an important technique in various applications including industrial process control, medical equipment, biological fabrication, etc. The reported optical fiber-based configurations so far, using gas-sensitive coating do not meet the stringent performance targets, such as fast response time and low limit of detection (LOD). Tin-base...
Article
Full-text available
Understanding ion transport kinetics and electrolyte-electrode interactions at electrode surfaces of batteries in operation is essential to determine their performance and state of health. However, it remains a challenging task to capture in real time the details of surface-localized and rapid ion transport at the microscale. To address this, a pro...
Article
The aim of this paper is to provide a comprehensive review of mode-division and spatial-division optical fiber sensors, mainly encompassing interferometers and advanced fiber gratings. Compared with their single-mode counterparts, which have a very mature field with many highly successful commercial applications, multimodal configurations have deve...
Article
The safe utilization of hydrogen as a clean fuel and industry material requires the reliable detection of gas leakage. Thus, hydrogen sensors with high sensitivity and fast response are in urgent demand. Optical hydrogen sensors are especially attractive among various hydrogen detection techniques because of their intrinsic safety. Herein, a high-s...
Article
Tilted fiber Bragg grating (TFBG) sensors are widely used in biochemical and electrochemical sensing due to their high sensitivity to refractive index (RI) of the surrounding medium. Ability of TFBGs to measure small RI change is currently limited due to the discrete spectral characteristics of TFBG cladding modes. Here we propose a novel method to...
Article
The tilted fiber Bragg grating (TFBG) is known as orientation-dependent (rotating along the axial direction) because of the directionality of the grating plane. Upon the orientation of the tilt plane the mode field distributions cross the fiber is no longer acting as an isotropic circularly symmetric pattern (i.e., the high order cladding modes), w...
Article
The pyroelectric effect converts thermal energy into usable electrical energy. It is an ideal and effective strategy to enhance the surface-enhanced Raman scattering (SERS) detection sensitivity by tuning the electromagnetic...
Article
High-sensitivity detection of heavy metal ions in solution is critical for environmental monitoring. In this paper, a dual-mode method namely hybrid electrochemical-surface plasmon resonance (SPR) microfiber sensor, is proposed for the detection of Pb2+. Gold-coated indium tin oxide (ITO) is used as a working electrode, and a gold nanofilm-coated m...
Article
One of the key elements for early diagnosis of acute and severe diseases is the development of ultra-sensitive detection methods, which are required to analyze the pathological state of the human body from trace amounts of substances in blood or urine. Surface plasmon resonance (SPR) optical fiber biosensors, particularly those based on tilted fibe...
Article
Developing lead-free ferroelectrics BiFeO3 with polarized electric field for tuning charge-transport properties in piezo-photocatalytic and ferro-photoelectrochemical (PEC) is highly desired but also challenging, especially defects such as impurity phases and oxygen vacancies lead to the weak polarization and large leakage current of BiFeO3. Here,...
Article
Microwave photonic interrogation of a high-speed and high-resolution multipoint refractive index (RI) sensor based on an Au-coated tilted fiber grating (Au-TFBG) array is proposed and experimentally demonstrated. Due to the surface plasmon resonance (SPR), the optical spectrum of an Au-TFBG has a dip in the spectral envelope. When an Au-TFBG is imm...
Article
Full-text available
The apparent increase in hormone-induced cancers and disorders of the reproductive tract has led to a growing demand for new technologies capable of detecting endocrine disruptors. However, a long-lasting challenge unaddressed is how to achieve ultrahigh sensitive, continuous, and in situ measurement with a portable device for in-field and remote e...
Article
Full-text available
A method to enable surface plasmon resonance (SPR) sensors to discriminate between bulk and surface-localized refractive index changes is demonstrated with modified gold-coated tilted fiber Bragg grating SPR sensors (TFBG-SPR). Without this capability, all high-resolution SPR sensors should be using reference channels and strict temperature control...
Article
Hydrogen sensors are of great importance to detect leakage in time because the hydrogen-air mixture is highly flammable. Based on optical fiber-based configurations reported so far, using palladium coating only does not meet stringent performance targets, such as fast response time and limited deactivation caused by poisoning. Here, a palladium-gol...
Article
Full-text available
The metal-to-dielectric transition of silver films deposited on single-mode optical fibers is monitored by measurements of the transmission spectra of tilted fiber Bragg gratings inscribed in the core of the fiber. In situ, real-time measurements of the spectrum at wavelengths near 1550 nm during the wet etching of a 50 nm thick silver coating show...
Article
Full-text available
Environmental monitoring and potable water control are key applications where optical fiber sensing solutions can outperform other technologies. In this work, we report a highly sensitive plasmonic fiber-optic probe that has been developed to determine the concentration of cadmium ions (Cd2+) in solution. This original sensor was fabricated by immo...
Article
We proposed and demonstrated a method to improve the birefringence of tilted fiber Bragg gratings (TFBGs) via high-refractive-index indium tin oxide (ITO) coatings. Firstly, we find the mode splitting phenomenon in an ITO film-coated TFBG. Numerical results show that the ITO coating can modulate the wavelength separations between two adjacent p- an...
Article
The coupling of less than 80 µW of in‐plane polarized near‐infrared light in a 6 nm‐thick graphene layer deposited on an optical fiber produces important permittivity changes leading to bistability and self‐starting 50% modulation of over 1 W of continuous wave light in the core. These features arise from resonant coupling of core‐guided light into...
Article
Microwave photonic interrogation of a high-speed and high-resolution refractive index (RI) sensor based on a tilted fiber Bragg grating with surface plasmon resonance (TFBG-SPR) is proposed and experimentally demonstrated. Instead of demodulating the wavelength shift or intensity change of a TFBG-SPR spectrum in the optical domain, we convert the T...
Article
Surface plasmon resonance excitation with tilted fiber Bragg gratings has been typically studied using gold films to target biochemical sensing applications. However, surface plasmons can be excited on other metal coatings as well. In this work, plasmonic optical fiber grating platforms are developed using palladium films. Since the optical propert...
Conference Paper
The combination of fiber-optic–based platforms for biosensing with nanotechnologies is opening up the chance for the development of in situ, portable, lightweight, versatile, reliable and high-performance optical sensing devices. The route consists of the generation of lossy mode resonances (LMRs) by means of the deposition of nm-thick absorbing me...
Article
Full-text available
This publisher’s note reports corrections in the author list and funding section of J. Opt. Soc. Am. B36, 1176 (2019)JOBPDE0740-322410.1364/JOSAB.36.001176.
Article
Real-time and high-sensitivity monitoring of heavy metal ions in solution is of great significance in environmental monitoring. Traditional electrochemical methods suffer from electrochemical noise and environmental interferences for heavy metal trace detection. To address these issues, we propose a novel electrochemical surface plasmon resonance (...
Article
We propose and demonstrate an ultra-sensitive plasmonic fiber-optic hot-wire anemometer. This instrument comprises a highly-tilted fiber Bragg grating-assisted surface plasmon resonance (SPR) sensor which is coated with carbon nanotubes as the photothermal conversion element. The carbon nanotubes on the sensor surface efficiently convert light from...
Article
An optical fiber twist sensor based on surface plasmon resonance (SPR) excitation and able to operate in both gaseous and liquid media is proposed and demonstrated. The use of a gold-coated 37.5° tilted fiber Bragg grating allows one to generate two windows of cladding mode resonances, providing surrounding refractive index sensitivity in two diffe...
Article
High-voltage transmission towers in coastal areas can be damaged by destructive hurricanes and strong seasonal winds. With real-time condition monitoring systems, severe and critical damage can be detected in the early stage, and appropriate solution taken. In this paper, we investigate the possibilities for real-time monitoring of wind-induced vib...
Article
In situ and continuous monitoring of electrochemical activity is key to understanding and evaluating the operation mechanism and efficiency of energy storage devices. However, this task remains challenging. For example, the present methods are not capable of providing the real-time information about the state of charge (SOC) of the energy storage d...
Article
Aptamer biosensor for label-free thrombin detection based on a tapered fiber-optic interferometer has been proposed and demonstrated. The biosensor probe can be easily fabricated by tapering a commercial double-cladding fiber down to 5 μm in diameter and it provides a high refractive index sensitivity of 1660 nm/RIU. The changes are determined by t...
Article
An in-situ strategy to understand the photocatalytic performance of Cu2O-Ag@rGO nanocomposites through interfacial photocatalysis on an optical microfiber has been proposed and experimentally demonstrated. The photocatalysts were conjugated on the surface of an optical microfiber immersed in an organic solution, forming an interface consisting of p...
Article
We have proposed and experimentally demonstrated a plasmonic titled fiber Bragg grating based biosensor for in-situ detection of the small biomolecule, S-adenosyl-L-homocysteine (AdoHcy). The sensor can also monitor the molecule's interaction with the protein Set7 in real-time. The biosensor is made by coating a 50-nm-thick gold film over an 18 $^\...
Article
A platinum coated singlemode-multimode (SM) structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor's performance and operation. Most materials have the same temperature but different thermal energy l...
Article
Full-text available
A platinum-coated singlemode-multimode structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor's performance and operation. Most materials have the same temperature but different thermal energy levels...
Article
A reflective fiber-optic refractometer based on a broadband cladding-to-core recoupling for a wide range of refractive index measurement is proposed and experimentally demonstrated. The sensing probe contains a tilted fiber Bragg grating (TFBG) together with an in-fiber “cladding” mirror upstream. The “cladding” mirror is made by a 0.3-μm-thick gol...
Article
Interfacing bio-recognition elements to optical materials is a longstanding challenge to manufacture sensitive biosensors and inexpensive diagnostic devices. In this work, a graphene oxide (GO) interface has been constructed between silica microfiber and bio-recognition elements to develop an improved γ-aminobutyric acid (GABA) sensing approach. Th...
Article
In situ and continuous monitoring of hydrogen concentration is a key to evaluate the operation mechanism and efficiency of hydrogen based green energy devices. However this task remains challenging. For example, the present methods are not capable of providing the complex permittivity of hydrogen sensitive material as a function of hydrogen concent...
Article
We present an optical fiber biosensor that employs both long-range and localized surface plasmon resonances (SPRs) to sensitively detect very small changes in the resonances due to the surrounding refractive index. A tilted optical fiber Bragg grating inscribed in standard single-mode fiber couples light into the fiber's cladding, where it induces...
Article
Full-text available
We propose and demonstrate hydrogen peroxide (H2O2) and glucose concentration measurements using a plasmonic optical fiber sensor. The sensor utilizes a tilted fiber Bragg grating (TFBG) written in standard single mode communication fiber. The fiber is over coated with an nm-scale film of silver that supports surface plasmon resonances (SPRs). Such...
Article
Surface plasmon resonance (SPR) optical fiber sensors can be used as cost-effective and relatively simple-to-implement alternatives to well established bulky prism configurations for high sensitivity in-situ biomedical measurements. The miniaturized size and remote operation ability offer a multitude of opportunities for single-point sensing in har...
Article
Recently, although great attention has been paid to the design and exploitation of new classes of near-infrared (NIR) light-induced materials, the photothermal dynamics of these materials has not been fully explored. However, understanding the photothermal dynamics of NIR-light-responsive composites is of fundamental importance from the viewpoint o...
Article
Full-text available
Plasmonic immunosensors are usually made of a noble metal (in the form of a film or nanoparticles) on which bioreceptors are grafted to sense analytes based on the antibody/antigen or other affinity mechanism. Optical fiber configurations are a miniaturized counterpart to the bulky Kretschmann prism and allow easy light injection and remote operati...
Article
In this Letter, high-quality WS2 film and MoS2 film were vertically stacked on the tip of a single-mode fiber in turns to form heterostructure (WS2-MoS2-WS2)-based saturable absorbers with all-fiber integrated features. Their nonlinear saturable absorption properties were remarkable, such as a large modulation depth (∼16.99%) and a small saturable...
Article
We propose and experimentally demonstrate a compact fiber-optic vibration sensor in which a tilted Bragg grating is inscribed in the core of a depressed cladding fiber. The sensor provides resolution up to 2×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> m/s <sup xmlns:mml="http://www.w3.o...
Article
Full-text available
A highly sensitive fiber-optic accelerometer based on detecting the power output of resonances from the core dip is demonstrated. The sensing probe comprises a compact structure, hereby a short section of specific core (with a significant core dip) fiber stub containing a straight fiber Bragg grating is spliced to another single-mode fiber via a co...
Article
The feasibility of Localized surface Plasmon resonance (LSPR) enhanced sensor based on raspberry-like nanospheres functionalized silica microfiber has been proposed and experimentally demonstrated. The extinction of single Ag (or Au) nanoparticles usually occur in visible wavelengths. Nevertheless, a LSPR enhancement at near infrared wavelengths ha...
Article
Full-text available
A miniature optical fiber ultrasonic sensor based on Fabry-Perot interferometer is proposed and experimentally demonstrated. The cavity of the interferometer is based a section of hollow core fiber coated with 353ND diaphragm. A well-define interference pattern is achieved and the spectral sideband filter technique is used to interrogate the sensor...
Article
Full-text available
A dual-frequency distributed Bragg reflector (DBR) fiber laser based sensor is demonstrated for low-frequency vibration measurement through the Doppler effect. The response of the proposed sensor is quite linear and is much higher than that of a conventional accelerometer. The proposed sensor can work down to 1 Hz with high sensitivity. Therefore,...
Article
A sensitive Ag⁺ sensor based on nucleic acid probes modified silica microfiber interferometry is designed and developed. The probes on microfiber surface plays the part on catching Ag⁺ as tentacles, while their conformation change from random coils to hairpins. It induces the fiber surface refractive index change, which is captured by the optical f...
Article
The conventional single-angle tilted fiber Bragg grating (TFBG) can only excite a certain range of cladding modes, limiting it for refractive index (RI) measurement in a wide range. In this letter, we fabricate and demonstrate a multi-angle TFBG, in which five individual TFBGs with tilt angles ranging from 5° to 25° are sequentially inscribed along...
Article
Full-text available
Correction for ‘Ultrasensitive and in situ DNA detection in various pH environments based on a microfiber with a graphene oxide linking layer’ by Yunyun Huang et al., RSC Adv., 2017, 7, 13177–13183.
Article
Full-text available
Ultrasensitive and in situ DNA detection at different pH values, ranging from 4.3 to 8.5, based on a microfiber with a graphene oxide linking layer was proposed and experimentally demonstrated. The graphene oxide coating over the silica microfiber provides a strong π–π interaction with the detected single-stranded DNA molecules, and induces an ampl...