Thomas Schimmel, Editor-in-Chief. Author information Article notes Copyright and License information Disclaimer. Corresponding author. Alfred J Meixner: ed. Received Aug 7; Accepted Aug Keywords: nano-optics, nanophotonics, nanospectroscopy. This article has been cited by other articles in PMC.
Notes This article is part of the Thematic Series "Nanophotonics, nano-optics and nanospectroscopy".
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References 1. Appl Phys Lett. Betzig E, Trautman J K.
Betzig E, Chichester R J. Chem Phys Lett. Novotny L, Hecht B. Numerical computations are carried out to obtain the exciton energy employing the variational formulism within the single band effective mass approximation. The oscillator strength and the radiative lifetime as a function of dot radius are found. The optical matrix elements and the corresponding gain are studied with the constant carrier density. The optical properties are investigated using density matrix method. It is found that the substantial increase of optical gain is estimated with the inclusion of built-in internal fields.
Silver—palladium nanocomposite films are widely used in electronics. They exhibit a photoresponse sensitive to the polarization and direction of a wave vector of an incident beam. It is established that the direct current bias applied to the film excites an additional component of the photocurrent, independent of the sign of the angle of incidence, the pulse duration of which is much longer than the one of the polarization- and wave vector direction-sensitive photocurrent.
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It is shown that depending on the sign of the angle of incidence, the direct current bias may decrease or increase the amplitude, pulse duration, and fall time of the total photocurrent pulse. With the help of numerical simulations in microscopic nonlinear quantum theory of coherent electromagnetic radiation interaction with a gapped bilayer graphene, we find the optimal values of pump wave intensity, graphene temperature, and energy gap induced by a constant electric field for practically significant third-order harmonic coherent emission.
The Liouville-von Neumann equation is treated numerically for the third harmonic generation in multiphoton excitation regime near the Dirac points of the Brillouin zone. The obtained results show that by choosing the optimal values of the main characteristic parameters, a gapped bilayer graphene can serve as an effective medium for generation of the third harmonic at room temperatures in the terahertz and far-infrared domains.
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A reconfigurable dual-passband to single-passband filter based on highly miniaturized ring resonators is presented. The filter is implemented using microstrip technology on a RO substrate with thickness of 1.
The lower passband can be eliminated by just changing the location of a short. Measurements for the optional eliminated band are in good agreement with the expected values. We propose a highly efficient ultra-broadband perfect absorber with a double-layer continuous spacer of SiO 2 and Si based on a simple four-layer structure Al—SiO 2 —Si—Ti.
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The absorber shows an average absorption over Highly efficient broadband absorption benefits from the surface plasmon resonance the propagating surface plasmon resonance and the localized surface plasmon resonance. Comparing the absorbers with different spacers, the proposed perfect absorber can be regarded as the superposition of two triple-layer structure absorbers.
In addition, the absorber is not only simple in structure and cheap in Al and Ti materials but also compatible with complementary metal oxide semiconductor technology, which means low cost and high efficiency. We believe that the proposed absorber has tremendous application prospects in areas such as solar energy, optical imaging, and infrared detection. A Mach—Zehnder interferometer based on processed hollow-core fiber HCF is proposed and experimentally demonstrated for gas pressure sensing.
The fiber sensor is fabricated by splicing a segment of HCF between the two coreless fibers. One end of the HCF is processed into an open cavity, which allows gas pressure of the air-core to be equivalent to that of the external environment. Gas pressure change induces refractive index change of the air-core, thus the measurement of gas pressure can be achieved by monitoring wavelength shift of the interference pattern.
The proposed fiber sensor exhibits a high gas pressure sensitivity of 9. Furthermore, the fiber sensor processes the advantages of compactness, low cost, and all-fiber configuration, which makes it suitable for gas pressure measurement. A reconfigurable structure is valuable for optical applications, and organic material such as proteins can be biased using external voltage for use in designing switchable gates.
Our study introduces the structure of a cylindrical nanoparticle chain waveguide with nine elements having a metal—organic—metal structure. The various numbers of active or inactive elements allow us to achieve a transmission line with multivalue quality. In addition, we have developed a more complicated structure based on cross-junction structure as the XOR gate so we can extract various models of the gate by altering the bias network. Therefore, the Yes gates in the bias network with control bits have been used to provide this characteristic and logical inverter.
Ultraviolet UV light is widely used in nanofabrication and biomedical fields.
However, in order to shape the wavefront of the UV beam, UV light needs to travel a relatively long distance in optical media that usually have strong UV absorptions. Thus the traditional UV lens is inefficient, costly, and easily aging under the radiation. Hopefully, dielectric metalenses represent a promising alternative. The metalens consists of AlN nanopillars and its focal length is about 4. In addition, the designed metalens still has an excellent convergence ability even at deg oblique incidence. This polarized-insensitive and achromatic metalens will greatly promote the development of UV photonic devices and UV nanophotonics.
We propose various optical ring gas sensors. These gas sensors are promising candidates for integrated on-chip sensing. The sensing operation depends on the change in the effective index. We show a detailed study of different sensors utilizing the absorption wavelength of both methane and carbon dioxide gases. These sensors mainly operate at the range of mid-infrared wavelengths because it contains the vibrational resonance of the gases of interest. We provide the details about the dimensions and the material used in our different structures.
We succeeded in squeezing the FWHM to 4. A theoretical study is presented to assess the performance of semiconductor superlattice SL multipliers as a function of the currently available input power sources. The prime devices that are considered as input power sources are Impatt diodes, InP Gunn devices, SL electron devices, and backward wave oscillator sources. The striking features of ecxitons in the carbon nanotube, multiple-exciton states, and microfluidic and extended-nano fluidic techniques.
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