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- 实验方案
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Transition Between Exciton-Polariton and Coherent Photonic Lasing in All-Inorganic Perovskite Microcuboid
摘要： All-inorganic lead halide perovskites are ideal platforms to investigate the fundamental physics of the light-matter interactions, due to their strong oscillator strength at room temperature and various microstructures. In this paper, we investigated strong exciton-photon coupling and coherent photonic lasing in a same high-quality self-assembled CsPbBr3 perovskite microcuboid grown by a chemical vapor deposition method. The vacuum Rabi splitting of polariton up to 309 meV, and the exciton-like and photon-like components in low polariton states at different cavity-exciton detuning, were revealed by angle-resolved photoluminescence spectra at room temperature. Moreover, we realized a coherent photonic lasing with a high quality-factor (4153) and narrow linewidth (0.13 nm) in the microcuboid above threshold (16 μJ/cm2), originated from population inversion. Significantly, the interference pattern of the coherent lasing through the Young's double-slit interference method based on far-field Fourier optical system, directly indicate the parity (odd) of the lasing mode and the asymmetric electric-field distribution in the CsPbBr3 microstructure. Our work demonstrates for the first time a transition from the strong coupling regime (vertical Fabry–Pérot oscillation) to weak coupling regime (lateral Fabry–Pérot oscillation) in such self-assembled microcuboid under the competition between gain and internal loss. Based on this mechanism, a considerable promise is expected to enrich the functions of micro-nano structure photoelectric devices by precisely controlling the quality-factor and gain of such microstructure.
关键词： Exciton-polaritons,Young's interference,Perovskite microcuboid,Photonic lasing,Fabry–Pérot microcavity
更新于2025-09-16 10:30:52
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Ultrathin Metasurface Wavelength-Selective Mirror for Millimeter/Terahertz Wave Fabry-Perot Cavities
摘要： We present an ultrathin metasurface working as both a highly reflective wavelength-selective mirror and a high transmittance output coupler for a semiconfocal Fabry-Perot cavity. The numerically optimized 2-μm-thick metasurface achieves a peak reflectivity of R = 99.35% at ω0 =94 GHz and peak transmittance of T ≈ 90% at the fourth harmonic (4ω0). Experimental results show that the metasurface FP cavity exhibits comparable quality factors to cavities enclosed by either a copper mirror or Bragg grating mirror. Our work highlights the potential for ultrathin metasurfaces to function as frequency selective mirrors in millimeter or terahertz wave cavities for various applications, such as nonlinear terahertz wave generation, material characterization, and imaging.
关键词： Fabry Perot,Terahertz,Metasurface
更新于2025-09-16 10:30:52
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Slow and fast single photons from a quantum dot interacting with the excited state hyperfine structure of the Cesium D1-line
摘要： Hybrid interfaces between distinct quantum systems play a major role in the implementation of quantum networks. Quantum states have to be stored in memories to synchronize the photon arrival times for entanglement swapping by projective measurements in quantum repeaters or for entanglement purification. Here, we analyze the distortion of a single-photon wave packet propagating through a dispersive and absorptive medium with high spectral resolution. Single photons are generated from a single in(Ga)As quantum dot with its excitonic transition precisely set relative to the cesium D1 transition. the delay of spectral components of the single-photon wave packet with almost Fourier-limited width is investigated in detail with a 200 MHz narrow-band monolithic Fabry-Pérot resonator. Reflecting the excited state hyperfine structure of Cesium, “slow light” and “fast light” behavior is observed. As a step towards room-temperature alkali vapor memories, quantum dot photons are delayed for 5 ns by strong dispersion between the two 1.17 GHz hyperfine-split excited state transitions. Based on optical pumping on the hyperfine-split ground states, we propose a simple, all-optically controllable delay for synchronization of heralded narrow-band photons in a quantum network.
关键词： slow light,optical pumping,single-photon wave packet,quantum networks,quantum dot,cesium D1 transition,fast light,Fabry-Pérot resonator
更新于2025-09-16 10:30:52
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Optical Fiber Fabry-Perot Acoustic Sensors Based on Corrugated Silver Diaphragms
摘要： In this manuscript, we fabricated and tested a series of extrinsic fiber Fabry-Perot interferometric acoustic sensors based on corrugated silver diaphragms. These diaphragms were fabricated through a simple and low-cost method. The corrugations were firstly etched on the silicon surface permanently and then transferred to the silver diaphragm with the help of photoresist as the sacrificial layer. Sensors with different corrugation depths were fabricated. Experimental results showed the same trend with theoretical results on the mechanical sensitivities of the fabricated corrugated diaphragms, which first increased and then decreased with the increase of the corruption’s depth. Other characteristics of the fabricated optical acoustic sensors based on corrugated silver diaphragms were also tested in details. The proposed fabrication method of the corrugated diaphragm showed the advantages of simplicity and low-cost, and the acoustic sensors showed high-sensitivity, which was suitable for weak acoustic’s sensing.
关键词： fiber,Fabry-Perot,acoustic sensor,corrugated silver diaphragm
更新于2025-09-12 10:27:22
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Novel Airflow Sensor Using Laser Heated Sn-microsphere Airgap Fiber Fabry–Pirot Interferometer
摘要： We proposed a novel fiber optic hot-wire anemometer based on an Sn metal airgap fiber Fabry–Pérot interferometer (AG-FFPI). An airgap can be naturally formed between the fiber endface and melting Sn metal via overlaying technique. The metal Sn microcavity is directly heated by a 980 nm pumping laser diode (LD) to obtain desired steady-state high temperature (T) of the Sn metal, which exceeds T of the surroundings. Cooling effect on the heated Sn metal by air flowing is converted to optical wavelength blue shifted of interference fringes. Experimental results demonstrate that the proposed Sn metal microcavity AG-FFPI has good performance for airflow measurement and high response to T in the metal Sn. An average sensitivity of about 0.62 nm/(m/s) over the airflow range of 0–10m/s is achieved with an Sn-microcavity of 9 μm and heated power of 45mW.
关键词： Metal,Airflow sensor,Fiber optic sensor,Fiber anemometer,Airgap fiber Fabry–Pérot interferometer
更新于2025-09-12 10:27:22
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Acquisition of Hyperspectral Data with Colloidal Quantum Dots
摘要： Hyperspectral sensors, combining the functions of photon detection with ultrahigh spectral resolution in a single device, have emerged as a new class of devices with significant potential for applications that rely on the input of optical information. Despite continued advancement, the widespread use of infrared hyperspectral sensors is still limited primarily due to the high cost associated with the growth and processing of epitaxial semiconductors, such as HgCdTe, InSb, and superlattices. Here, it is shown that colloidal quantum dots (CQDs) provide a promising route toward low-cost, compact, and sensitive infrared hyperspectral sensors with tunable sensing ranges. In total, 64 narrowband channels with full-width at half-maxima down to ≈30 cm?1 can be realized by directly integrating CQDs sensors with a distributed Bragg mirror filter array. The results of high-resolution spectra measurement with resolving power up to 180 and acquisition of a hyperspectral image cube in the short-wave infrared range, benefiting from the fast (≈120 ns) and sensitive (>1010 Jones) performance of the CQDs sensors, are experimentally demonstrated.
关键词： colloidal quantum dots,Fabry–Perot filters,hyperspectral sensors,infrared detectors
更新于2025-09-12 10:27:22
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Enhanced transmitting and blocking filter design approach for laser scanning applications based on combining GSM and AFGSM methods
摘要： We present a novel and robust filter design method, developed for one-dimensional photonic crystal-based filters. Hybrid filter structures are presented comprising periodic and degenerated multilayered dielectric structures. The proposed approach provides significant flexibility in designing desired transmission band while offering widened stop-bands. In obtaining the transmission characteristics we utilize the Auxiliary Functions of Generalized Scattering Matrix Method (AFGSM), already proven to provide computational advantages in obtaining bandgap edge frequencies without solving an eigenvalue equation. With the proposed design strategy, we showcase its efficacy through designing four different filters that are utilized in laser scanning microscopy; namely a laser line filter at 800 nm wavelength for reflectance confocal microscopy, a band-pass filter at 400 nm wavelength for second harmonic generation microscopy, a laser block filter at 800 nm wavelength and a dichroic filter blocking 350-400 nm while transmitting higher wavelengths for multiphoton microscopy.
关键词： Multilayered Dielectrics,Optical Filters,Fabry-Perot Resonators,Auxiliary Functions of Generalized Scattering Matrix (AFGSM),Photonic Bandgaps (PBGs),Laser Scanning Microscopy (LSM)
更新于2025-09-12 10:27:22
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A Fast and Reproducible ELISA Laser Platform for Ultrasensitive Protein Quantification
摘要： Optofluidic lasers are currently of high interest for sensitive, intra-cavity, biochemical analysis. In comparison with conventional methods such as fluorescence and colorimetric detection, optofluidic lasers provide a method for amplifying small concentration differences in the gain medium, thus achieving high sensitivity. Here we report the development of an on-chip ELISA (enzyme-linked immunosorbent assay) laser platform that is able to complete an assay in short amount of time with small sample/reagent volumes, large dynamic range, and high sensitivity. The arrayed micro-scale reaction wells in the ELISA lasers can be microfabricated directly on dielectric mirrors, thus significantly improving the quality of the reaction wells and detection reproducibility. The details of the fabrication and characterization of those reaction wells on the mirror are described and the ELISA laser assay protocols are developed. Finally, we applied the ELISA laser to detecting IL-6, showing that a detection limit of about 0.1 pg/mL can be achieved in 1.5 hours with 15 μL of sample/reagents per well. This work pushes the ELISA laser a step closer to solving problems in real-world biochemical analysis.
关键词： Interleukin-6,Fabry-Perot cavity,Immunoassay,Optofluidic laser,Microfabrication,ELISA
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - On Chip Sub-Wavelength Grating Fabry-Perot Cavity, toward Integrated Cavity Optomechanics Applications
摘要： Sub-Wavelength Grating (SWG) periodic media are comprised of alternative dielectric layers with a pitch Λ small enough in comparison to the wavelength to supress any diffraction or interference effect. As a good first approximation, SWG media can be considered as uniform and lossless ones, with an averaging effect over the dielectric permittivity [1]. The use of SWG media as core and/or cladding materials of optical waveguides was first proposed and demonstrated in 2010 [2] as a way to realize easy engineering of the refractive guided index of light with simple lithographic patterning. Since then, SWG waveguides have found various applications such as waveguide crossing, multimode interferometers, optical filters, mid-infrared waveguides, or even optical biosensing [3]. We propose to include SWG waveguides within a suspended Fabry-Perot (FP) cavity (see Fig. 1a). The core of the cavity is formed by alternative Silicon and Air SWG layers, while the input and output mirrors are two Direct Bragg Reflectors (DBR). The whole structure is fully suspended through the use of two support arms. We present the theoretical modelization, technological realization and optical characterisations of such a cavity. The design was conducted through both an analytical model that treats SWG media with equivalent refractive indexes, and two dimensional effective index Finite-Difference Time-Domain (FDTD) simulations. Actual devices were realized on 200 mm silicon on insulator (SOI) wafers in our clean room facilities with e-beam patterning of the waveguide level, and characterized via full-scale wafer optical spectrum measurement between 1520 nm and 1580 nm. At time of writing, we measured optical quality factors of 10 000 over 2 μm long cavities. We believe this kind of suspended structure can be used in the field of Cavity Optomechanics, where an optical cavity is coupled to a mechanical resonator [4]. Indeed, because it is fully suspended, we await mechanical resonance to occur, the cavity behaving similarly to a doubly clamped holey cantilever (see Fig. 1c). Apart from the traditional optical phase shift occurring with propagation length variations of the cavity, there should also be a phase shift arising from the SWG nature of the waveguide, whose equivalent refractive index depends on the pitch Λ (and thus length) of the cavity. Due to this additional effect, we expect a strong optomechanical coupling rate.
关键词： Sub-Wavelength Grating,silicon on insulator,optical waveguides,Fabry-Perot cavity,cavity optomechanics
更新于2025-09-12 10:27:22
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High-sensitivity hydraulic pressure sensor based on Fabry-Perot interferometer filled with polydimethylsiloxane film
摘要： A high-sensitivity hydraulic pressure sensor is proposed, which consists of a Fabry–Perot interferometer (FPI) filled with a polymer film of polydimethylsiloxane (PDMS). The FPI structure is fabricated by splicing a section of hollow core fiber (HCF) to the end-face of a lead-in single mode fiber (SMF). Then, the PDMS is filled into the HCF which acts as a light reflector and a diaphragm to detect external pressure variation. As a result, the length of the FPI cavity and the thickness of the PDMS are 137.8 μm and 33.8 μm, respectively. Experimental results indicate that the sensor’s wavelength exhibits a linear response to the hydraulic pressure, which function is described as y = ?7.35 × 10?3x + 1536.395. Here, x and y represent the hydraulic pressure and the wavelength, respectively. The pressure sensitivity is up to ?7.35 nm/kPa. Besides, a temperature compensation method based on a fiber Bragg grating is proposed to eliminate the influence of temperature. Experiments show that the scheme can effectively eliminate the influence of temperature and achieve accurate measurement of hydraulic pressure.
关键词： Fabry-Perot interferometer,polydimethylsiloxane,temperature compensation,hydraulic pressure sensor,fiber Bragg grating
更新于2025-09-12 10:27:22