scholarly journals Cavity-enhanced detection of transient absorption signals

2020 ◽  
Vol 238 ◽  
pp. 12003
Author(s):  
Fernanda C. Rodrigues-Machado ◽  
Pauline Pestre ◽  
Liam Scanlon ◽  
Shirin A. Enger ◽  
Jack C. Sankey ◽  
...  
Keyword(s):  
Radiation Dosimetry ◽  
Loss Rate ◽  
Cavity Mode ◽  
Group Delay ◽  
Transient Absorption ◽  
Optical Absorption Measurement ◽  
High Duty Cycle ◽  
Internal Loss ◽  
Fabry Perot ◽  
Potential Applications

We present a simple, high-duty-cycle, cavity-enhanced optical absorption measurement technique based on delay-limited Pound-Drever-Hall (PDH) sideband locking. The chosen circuit naturally provides realtime readout of the amplitude quadrature of the PDH error signal, which can be mapped onto the cavity’s internal loss rate while using the phase quadrature to lock sideband frequency to the cavity mode. Our proofof-concept device comprises a 5-cm-long Fabry-Perot cavity with a 450 kHz bandwidth (finesse 6800, 350 ns power ringdown), and a feedback bandwidth of several MHz, limited primarily by the group delay of our electronics. This technique could readily be applied to other optical resonators such as fiber cavities, with potential applications in radiation dosimetry.

scholarly journals Enhanced Entanglement in Hybrid Cavity Mediated by a Two-way Coupled Quantum Dot

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 14-23
Author(s):  
Ming-Cui Li ◽  
Ai-Xi Chen
Keyword(s):  
Quantum Dot ◽  
Cavity Mode ◽  
Multipartite Entanglement ◽  
Cavity Field ◽  
Mechanical Resonator ◽  
System A ◽  
Fabry Perot ◽  
Potential Applications ◽  
Cavity System ◽  
Hybrid Cavity

AbstractWe investigate theoretically the entanglement in a hybrid Fabry-Perot cavity system. A membrane in the cavity acts as a mechanical resonator, and a two-level quantum dot is coupled to both the cavity mode and the mechanical resonator. The entanglements between the cavity field and the mechanical resonator, between the mechanical resonator and the quantum dot, as well as between the cavity field and the quantum dot are observed. The logarithmic negativities in the first two subsystems are much larger than those in the system without two-way coupled quantum dot, and the entanglements are robust against the thermal temperature (entanglements still exist in tens of Kelvin). We also find that without direct coupling between the cavity field and the mechanical resonator, one can till observe effective entanglement between them in our system. Our work is helpful and may have potential applications in the research of multipartite entanglement in physical system.

scholarly journals SnSe Nanosheets: From Facile Synthesis to Applications in Broadband Photodetections

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 49
Author(s):  
Xiangyang Li ◽  
Zongpeng Song ◽  
Huancheng Zhao ◽  
Wenfei Zhang ◽  
Zhenhua Sun ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Ultrafast Optics ◽  
Light Response ◽  
Transient Absorption Spectroscopy ◽  
Monolayer Graphene ◽  
Proof Of Concept ◽  
Facile Synthesis ◽  
Femtosecond Transient Absorption ◽  
Potential Applications ◽  
Promising Area

In recent years, using two-dimensional (2D) materials to realize broadband photodetection has become a promising area in optoelectronic devices. Here, we successfully synthesized SnSe nanosheets (NSs) by a facile tip ultra-sonication method in water-ethanol solvent which was eco-friendly. The carrier dynamics of SnSe NSs was systematically investigated via a femtosecond transient absorption spectroscopy in the visible wavelength regime and three decay components were clarified with delay time of τ1 = 0.77 ps, τ2 = 8.3 ps, and τ3 = 316.5 ps, respectively, indicating their potential applications in ultrafast optics and optoelectronics. As a proof-of-concept, the photodetectors, which integrated SnSe NSs with monolayer graphene, show high photoresponsivities and excellent response speeds for different incident lasers. The maximum photo-responsivities for 405, 532, and 785 nm were 1.75 × 104 A/W, 4.63 × 103 A/W, and 1.52 × 103 A/W, respectively. The photoresponse times were ~22.6 ms, 11.6 ms, and 9.7 ms. This behavior was due to the broadband light response of SnSe NSs and fast transportation of photocarriers between the monolayer graphene and SnSe NSs.

Measurement of the group delay of laser mirrors by a Fabry–Perot interferometer

1995 ◽  
Vol 20 (22) ◽  
pp. 2339 ◽  
Author(s):  
K. Osvay ◽  
R. Szipöcs ◽  
G. Kurdi ◽  
J. Hebling ◽  
A. P. Kovács ◽  
...  
Keyword(s):  
Group Delay ◽  
Fabry Perot

scholarly journals Boosting Self-interaction of Molecular Vibrations under Ultra-strong Coupling Condition

2021 ◽  
Author(s):  
Akhila Kadyan ◽  
Anil Shaji ◽  
Jino George
Keyword(s):  
Oscillator Strength ◽  
Strong Coupling ◽  
Cavity Mode ◽  
Linear Increase ◽  
Vacuum Field ◽  
New Paradigm ◽  
Coupling Condition ◽  
Field Coupling ◽  
Fabry Perot ◽  
Set Up

In this letter, we investigated the modification of oscillator strength of an asymmetric stretching band of CS<sub>2</sub> by strong coupling to an infrared cavity photon. This is achieved by placing liquid CS<sub>2</sub> in a Fabry-Perot resonator and tune the cavity mode position to match with the molecular vibrational transition. Ultra-strong coupling improves the self-interaction of transition dipoles of asymmetric stretching band of CS<sub>2</sub> that resulted in an increase of its own oscillator strength. We experimentally proved this by taking the area ratio of asymmetric stretching and combination band by selectively coupling the former one. A non-linear increase in the oscillator strength of the asymmetric stretching band is observed upon varying the coupling strength. This is explained by a quantum mechanical model that predicts quadratic behavior under ultra-strong coupling condition. These findings will set up a new paradigm for understanding chemical reaction modification by vacuum field coupling.

scholarly journals Excited state dynamics for visible-light sensitization of a photochromic benzil-subsituted phenoxyl-imidazolyl radical

2019 ◽  
Vol 15 ◽  
pp. 2369-2379
Author(s):  
Yoichi Kobayashi ◽  
Yukie Mamiya ◽  
Katsuya Mutoh ◽  
Hikaru Sotome ◽  
Masafumi Koga ◽  
...  
Keyword(s):  
Visible Light ◽  
Rational Design ◽  
Materials Science ◽  
Transient Absorption ◽  
Life Sciences ◽  
Transient Absorption Spectroscopy ◽  
Back Reaction ◽  
Switching Speed ◽  
Wide Range ◽  
Potential Applications

Visible-light sensitized photoswitches have been paid particular attention in the fields of life sciences and materials science because long-wavelength light reduces photodegradation, transmits deep inside of matters, and achieves the selective excitation in condensed systems. Among various photoswitch molecules, the phenoxyl-imidazolyl radical complex (PIC) is a recently developed thermally reversible photochromic molecule whose thermal back reaction can be tuned from tens of nanoseconds to tens of seconds by rational design of the molecular structure. While the wide range of tunability of the switching speed of PIC opened up various potential applications, no photosensitivity to visible light limits its applications. In this study, we synthesized a visible-light sensitized PIC derivative conjugated with a benzil unit. Femtosecond transient absorption spectroscopy revealed that the benzil unit acts as a singlet photosensitizer for PIC by the Dexter-type energy transfer. Visible-light sensitized photochromic reactions of PIC are important for expanding the versatility of potential applications to life sciences and materials science.

Direction-Independent Band Gaps Extension Based on Thue-Morse Photonic Heterostructures Containing Negative-Index Materials

2011 ◽  
Vol 675-677 ◽  
pp. 1077-1080 ◽  
Author(s):  
Ou Yang Hong ◽  
Xin Hua Deng
Keyword(s):  
Optical Fibers ◽  
Transverse Electric ◽  
Negative Index ◽  
Reflection Band ◽  
Negative Index Materials ◽  
One Dimensional ◽  
Fabry Perot ◽  
Potential Applications ◽  
New Type ◽  
Positive Index

The band structure and photonic spectrum of one dimensional Thue-Morse quasicrystal composed by negative-index materials and positive-index materials are studied. We show that a new type of the omnidirectional reflection band (ORB) exists in Thue-Morse photonic heterostructures. Compared to a single Thue-Morse quasicrystal, the frequency range of the ORB in a Thue-Morse photonic heterostructure can be notably enlarged, and the width and location of the ORB do not change with Thue-Morse order. The lower edge of the ORB depends only on transverse electric (TE) polarization, while the higher edge of the ORB depends only on transversemagnetic (TM) polarization. These results imply potential applications in improving planar microcavities, optical fibers, and Fabry–Perot resonators, etc.

scholarly journals Large and dynamical tuning of a chalcogenide Fabry-Perot cavity mode by temperature modulation

2010 ◽  
Vol 18 (3) ◽  
pp. 3168 ◽  
Author(s):  
Mecit Yaman ◽  
H. Esat Kondakci ◽  
Mehmet Bayindir
Keyword(s):  
Cavity Mode ◽  
Temperature Modulation ◽  
Fabry Perot

scholarly journals Deep subwavelength Fabry-Perot resonances

2014 ◽  
Vol 1 ◽  
pp. 2 ◽  
Author(s):  
Cheng-Ping Huang ◽  
Che-Ting Chan
Keyword(s):  
Cavity Length ◽  
Ground Plane ◽  
Field Enhancement ◽  
Photonic Devices ◽  
Narrow Slit ◽  
Penetration Effect ◽  
Mechanical Oscillations ◽  
Fabry Perot ◽  
Potential Applications ◽  
Electromagnetic Pressure

Confinement of light by subwavelength objects facilitates the realization of compact photonic devices and the enhancement of light-matter interactions. The Fabry-Perot (FP) cavity provides an efficient tool for confining light. However, the conventional FP cavity length is usually comparable to or larger than the light wavelength, making them inconvenient for many applications. By manipulating the reflection phase at the cavity boundaries, the FP cavity length could be made much smaller than the wavelength. In this review, we consider the subwavelength FP resonance in a plasmonic system composed of a slit grating backed with a ground plane, covering the spectral range from microwave to THz and infrared regime. For very narrow slit width and spacer thickness, a typical zero-order and deep subwavelength FP resonance in the metallic slits can be strongly induced. Moreover, due to the subwavelength FP resonance, greatly enhanced electromagnetic pressure can also be induced in the system. The sign and magnitude of the electromagnetic pressure are dominated by the field penetration effect in the metal as well as the field enhancement in the FP cavities. The effect promises a variety of potential applications, such as detecting tiny motions and driving the mechanical oscillations.

scholarly journals Cavity Catalysis ‒Accelerating Reactions under Vibrational Strong Coupling‒

2018 ◽  
Author(s):  
Hidefumi Hiura ◽  
Atef Shalabney ◽  
Jino George
Keyword(s):  
Electromagnetic Field ◽  
Strong Coupling ◽  
Chemical Reactions ◽  
Reaction Rate ◽  
Cavity Mode ◽  
Coupling Ratio ◽  
Strong Light ◽  
Rabi Splitting ◽  
Fabry Perot ◽  
Splitting Energy

<p>In conventional catalysis the reactants interact with specific sites of the catalyst in such a way that the reaction barrier is lowered and the reaction rate is accelerated. Here we take a radically different approach to catalysis by strongly coupling the vibrations of the reactants to the vacuum electromagnetic field of a cavity. To demonstrate the possibility of such cavity catalysis, we have studied hydrolysis reactions under strong coupling of the OH stretching mode of water to a Fabry-Pérot (FP) microfluidic cavity mode. This results in an exceptionally large Rabi splitting energy ℏΩ<sub>R</sub> of 92 meV (740 cm<sup>−1</sup>), indicating the system is in vibrational ultra-strong coupling (V-USC) regime and we have found that it enhances the hydrolysis reaction rate of cyanate ions by 10<sup>2</sup> times and that of ammonia borane by 10<sup>4</sup> times. This catalytic ability is shown to depend only upon the cavity tuning and the coupling ratio. Given the vital importance of water for life and human activities, we expect our finding not only offers an unconventional way of controlling chemical reactions by ultra-strong light-matter interactions, but also changes the landscape of chemistry in a fundamental way.</p>

scholarly journals Excited State Dynamics for Visible Light Sensitization of Fast Photochromic Phenoxyl-Imidazolyl Radical Complex with Aryl Ketone

2019 ◽  
Author(s):  
Yoichi Kobayashi ◽  
Yukie Mamiya ◽  
Katsuya Mutoh ◽  
Hikaru Sotome ◽  
Masafumi Koga ◽  
...  
Keyword(s):  
Visible Light ◽  
Life Science ◽  
Materials Science ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Back Reaction ◽  
Switching Speed ◽  
Radical Complex ◽  
Wide Range ◽  
Potential Applications

Visible light sensitized photoswitches have been paid particular attention in the fields of life science and materials science because long-wavelength light reduces photodegradation, transmits deep inside of matters, and achieves the selective excitation in condensed systems.Among various photoswitch molecules, phenoxyl-imidazolyl radical complex (PIC) is a recently developed thermally-reversible photochromic molecule whose thermal back reaction can be tuned from tens of nanoseconds to tens of seconds by rational designs of the molecular structure. While the wide range of tunability of the switching speed of PIC opened up various potential applications, no photosensitivity to visible light limits its applications. In this study, we synthesized a visible light sensitized PIC derivative conjugated with a benzil unit. Femtosecond transient absorption spectroscopy revealed that the benzil unit acts as a singlet photosensitizer for PIC by the Dexter-type energy transfer. Visible light sensitized photochromic reactions of PIC are important for expanding the versatility of potential applications to life science and material science.

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