Results 51 to 60 of about 29,414 (207)

Novel Broadband Amplifier for Mid-Infrared Semiconductor laser and applications in spectroscopy [PDF]

, 2010
An amplifier design for broadband Mid-IR buried-hetero (BH) structure epitaxial laser is presented, and external cavity design based on this amplifier is described.
Deev, Andrei, Li, Zhenyu, Scherer, Axel, Tang, Yongchun, Wu, Sheng   +4 more
core   +1 more source

Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic Encryption from Visible to Infrared Wavelengths

Advanced Optical Materials, EarlyView.
Whispering‐gallery‐mode microresonators with sharp resonant peaks enable photonic barcoding. Similar to a chameleon, a rare‐earth‐free microcavity with π‐conjugated PAHs enables visibleto‐near infrared color generation from a single microbead. The unique resonat emission (spectral barcode) can be dynamically transformed via excitation wavelength change,
Barun Kumar Barman, Keisuke Watanabe, Kenzo Deguchi, Shinobu Ohki, Kenjiro Hashi, Atsushi Goto, Tadaaki Nagao   +6 more
wiley   +1 more source

Label-Free Biological and Chemical Sensing Using Whispering Gallery Mode Optical Resonators: Past, Present, and Future

Sensors, 2017
Sensitive and rapid label-free biological and chemical sensors are needed for a wide variety of applications including early disease diagnosis and prognosis, the monitoring of food and water quality, as well as the detection of bacteria and viruses for ...
Judith Su
doaj   +1 more source

Modified permittivity observed in bulk Gallium Arsenide and Gallium Phosphide samples at 50 K using the Whispering Gallery mode method

, 2008
Whispering Gallery modes in bulk cylindrical Gallium Arsenide and Gallium Phosphide samples have been examined both in darkness and under white light at 50 K. In both samples we observed change in permittivity under light and dark conditions.
Cros, D., Floch, J-M. Le, Hartnett, J. G., Krupka, J., Mouneyrac, D., Tobar, Michael E.   +5 more
core   +1 more source

Compensation of thermal nonlinearity effect in optical resonators [PDF]

, 2011
Thermal nonlinearity is known to cause bistability in Whispering Gallery Mode (WGM) resonators and to destabilize the red slope of the Lorentzian resonant curve.
Chen, Tong, Grudinin, Ivan, Lee, Hansuek, Vahala, Kerry   +3 more
core   +1 more source

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

Microfluidic flowmeter based on a liquid crystal-filled nested capillary

Communications Engineering
Microfluidic flowmeters are a powerful and highly accurate tool, enabling precise monitoring and measurements of flows of gases and fluids in a range of applications.
Zhe Wang, Arun Kumar Mallik, Fangfang Wei, Zhuochen Wang, Anuradha Rout, Rayhan Habib Jibon, Qiang Wu, Yuliya Semenova   +7 more
doaj   +1 more source

Carrier-induced refractive index change observed by a whispering gallery mode shift in GaN microrods

New Journal of Physics, 2015
Vertical oriented GaN microrods were grown by metal-organic vapor phase epitaxy with four different n-type carrier concentration sections above 10 ^19 cm ^−3 along the c -axis.
C Tessarek, R Goldhahn, G Sarau, M Heilmann, S Christiansen   +4 more
doaj   +1 more source

Trapping photons with optical black hole

Light: Science & Applications, 2023
An optical black-hole cavity based on transformation optics enables Q-factor enhancement and strong field confinement, by eliminating the intrinsic radiation loss of the conventional whispering-gallery modes, holding potential for applications in energy ...
You-Ling Chen, Qi-Tao Cao, Yun-Feng Xiao
doaj   +1 more source

Tests of Sapphire Crystals Produced with Different Growth Processes for Ultra-stable Microwave Oscillators

, 2015
We present the characterization of 8-12 GHz whispering gallery mode resonators machined in high-quality sapphire crystals elaborated with different growth techniques.
Dubois, Benoit, Fluhr, Christophe, Giordano, Vincent, Grop, Serge   +3 more
core   +3 more sources