Article
Biophysics
Kuo Zhong, Wei Yu, Yovan de Coene, Atsushi Yamada, Olga Krylychkina, Stijn Jooken, Olivier Deschaume, Carmen Bartic, Koen Clays
Summary: By introducing chemical heterostructures in hollow sphere CPCs, fluorescence enhancement can be achieved in water, providing new design principles for functionalized photonic devices.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Davide Priante, Mingyang Zhang, Alexander R. Albrecht, Roman Bek, Michael Zimmer, Catherine L. Nguyen, David P. Follman, Garrett D. Cole, Mansoor Sheik-Bahae
Summary: This paper presents a detailed study on the performance of a membrane external-cavity surface-emitting laser (MECSEL) under different pumping configurations. The authors propose and implement an improved pumping scheme for in-well pumping, which achieves higher output power and efficiency.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Yadi Wang, Masanobu Haraguchi, Xingbo Zhang, Pingping Wang, Shufeng Sun
Summary: A new method is proposed to enhance the optical confinement of a vertical cavity surface emitting laser (VCSEL) by introducing a square-lattice photonic crystal structure. The filling factor of this structure was optimized based on computation of the energy band structure and optical band values. By adjusting the length of the resonant cavity, a VCSEL with two wavelengths can be created without current injection. Numerical calculations show that incorporating a cubic photonic crystal structure in the VCSEL results in a 2x increase in the difference frequency intensity and a 6.33x increase in the optical field intensity.
Article
Chemistry, Multidisciplinary
Margherita Angelini, Eliana Manobianco, Paola Pellacani, Francesco Floris, Franco Marabelli
Summary: The recent development and technological improvement in dealing with plasmonic metasurfaces have led to interesting applications in sensing challenges. The study focused on the influence of well-characterized structures supporting plasmonic resonances on the emission efficiency of a fluorophore. The results showed the spectral dependence of fluorescence on the plasmonic field distribution and its connection with the enhancement of the signal.
Article
Optics
Vakhtang Jandieri, Ramaz Khomeriki, Koki Watanabe, Daniel Erni, Douglas H. Werner, Jamal Berakdar
Summary: Realization of externally tunable chiral photonic sources and resonators using oxide-based stacks of helical multiferroic layers, provides a suitable, electrically-controllable medium to efficiently trap and filter purely chiral photonic fields.
Article
Crystallography
Zhuo Zhang, Jianwei Zhang, Ziye Du, Haopeng Bai, Jiye Zhang, Tianjiao Liu, Yinli Zhou, Xing Zhang, Chao Chen, Li Qin, Yongqiang Ning, Lijun Wang
Summary: This paper presents a single-chip VECSEL device that can switch between dual-wavelength and single-wavelength output modes. By adjusting the pump power and the temperature of the active region, the output mode and wavelength spacing of the VECSEL can be controlled. The device has a small beam divergence angle and high dual-wavelength output power.
Article
Chemistry, Physical
Margherita Angelini, Eliana Manobianco, Paola Pellacani, Francesco Floris, Franco Marabelli
Summary: In the context of surface-enhanced fluorescence sensors, plasmonic gratings are gaining significant attention. The features of the grating can control plasmonic modes, thereby strongly affecting the fluorescence response. This study focuses on using a buffer solution flowing across the active surface of the grating to mimic real measurements. By altering the refractive index of the surrounding medium, the resonance conditions are modified, resulting in a shift in the spectral features and a reshaping of the fluorescence emission in terms of spectral weight and direction.
Article
Optics
Mingyang Zhang, Alexander R. Albrecht, Catherine Nguyen, David Follman, Garrett D. Cole, Mansoor Sheik-Bahae
Summary: We have developed, analyzed, and demonstrated a novel optically-pumped semiconductor disk laser with an active mirror architecture. The laser is capable of generating an output power of approximately 30W in a TEM00 mode, surpassing the performance of traditional VECSELs.
Article
Optics
Xinqian Guo, Linbo Zhang, Long Chen, Jun Liu, Tao Liu, Shougang Zhang
Summary: A diode laser with external cavity based on intra-cavity electro-optic modulator tuning is proposed in this paper. Lithium niobate (LiNbO3) crystal is utilized instead of the traditional piezoelectric transducer (PZT) for its non-hysteresis effect and high response speed. The linewidth of the laser in free-running mode is around 133 kHz. Furthermore, the laser locking is achieved by feeding back the error signal to the driving voltage of LiNbO3 in an ultra-narrow linewidth laser system, avoiding the laser output power fluctuation caused by feedback to the injection current. Experimental results demonstrate a linewidth of approximately 1.5 Hz for the beat frequency signal in the self-developed crystal-tuned laser.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Zhuo Zhang, Jianwei Zhang, Jiye Zhang, Yugang Zeng, Jun Zhang, Yinli Zhou, Xing Zhang, Li Qin, Yun Liu, Yongqiang Ning, Lijun Wang
Summary: The study introduces an optically pumped VECSEL laser that can emit two switchable wavelengths from a single chip. Quantum wells with two gain wavelengths are used in the active region of the gain chip, allowing for wavelength switching and different output powers at varying pump powers.
Article
Chemistry, Multidisciplinary
Lun Qu, Zhidong Gu, Chenyang Li, Yuan Qin, Yiting Zhang, Di Zhang, Jiaxian Zhao, Qiang Liu, Chunyan Jin, Lishuan Wang, Wei Wu, Wei Cai, Huasong Liu, Mengxin Ren, Jingjun Xu
Summary: This study demonstrates resonantly enhanced second harmonic generation (SHG) through photonic vertical cavities consisting of nonlinear materials embedded in photonic crystals (PhCs). By constructing a vertical cavity with a lithium niobate membrane placed between two PhCs, a high SHG efficiency of 0.28% is achieved. The results open up new possibilities for compact laser frequency converters, revolutionizing the fields of nonlinear optics and photonics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Qi Cheng, Shutao Wang, Na Liu
Summary: A two-dimensional photonic crystal array structure was designed to enhance the fluorescence intensity of sulfur dioxide in the UV band, achieving a high sensitivity of 1.224 L.mg(-1). The measured results showed a 10-fold improvement in intensity compared to without the PhC structure at room temperature.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Yanlin Li, Xuegang Lu, Sen Yang
Summary: Fluorescence detection utilizing metal-based micro or nano structures with surface enhanced fluorescence (SEF) effect is efficient in responding to various diseases and environmental issues. By designing SEF substrates with controllable fluorescence enhancement through magnetically responsive CoFe2O4@SiO2@Ag colloidal photonic crystals, selective enhancement of fluorescence spectra at different wavelengths can be achieved for detecting different fluorescent molecules such as Rhodamine B and fluorescein isothiocyanate (FITC). Matching the tunable photonic band gap with the fluorescence emission wavelength of the molecules results in significant enhancement factors, making the substrates reliable, sensitive, and reproducible for detecting fluorescent molecules in chemical analysis, biological sensing, and cell imaging applications.
Article
Nanoscience & Nanotechnology
S. Sudha Maria Lis, Seemesh Bhaskar, Rahul Dahiwadkar, Sriram Kanvah, Sai Sathish Ramamurthy, B. N. Shivakiran Bhaktha
Summary: The functionality of metallic and dielectric nanomaterials in generating intense electromagnetic field hotspots has been explored for biosensing applications. However, parasitic Ohmic losses and the presence of metallic components have limited the fluorescence intensity. In this study, high refractive index and biocompatible BCZT nanoparticles were used to significantly enhance the fluorescence signal in both metal-dependent and lossless platforms.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Minsu Kang, Jin Heesoo, Heonsu Jeon
Summary: Projection photolithography using extreme-ultraviolet light source is crucial for fabricating nanoscale patterns for electronic chips, but not necessary for photonics. A cost-effective and high-throughput lithographic technique for submicron pattern generation is in high demand. The maskless digital photolithography (MDPL) technique has shown promise in addressing this demand and has been successfully used to fabricate submicron periodicity photonic crystal patterns.
