Indirect Measurements of Coherent Thermal Emission From a Truncated Photonic Crystal Structure

2007 ◽  
Author(s):  
B. J. Lee ◽  
Y. -B. Chen ◽  
Z. M. Zhang
Keyword(s):  
Photonic Crystal ◽  
Near Infrared ◽  
Thermal Emission ◽  
Incidence Angle ◽  
Stop Band ◽  
Spatial Coherence ◽  
Infrared Region ◽  
Silver Layer ◽  
Specular Reflectance ◽  
Infrared Spectrometer

Recently, coherent thermal emission characteristics have been demonstrated for both polarizations from a multilayer structure consisting of a one-dimensional (1D) photonic crystal (PC) coated on a silver layer, i.e., PC-on-Ag structure. The key to enabling coherent emission is to excite a surface wave at the PC-Ag interface in the stop band of the PC. A detailed experimental investigation is conducted to demonstrate coherent thermal emission in the near-infrared region from the fabricated PC-on-Ag structure. A Fourier-transform infrared spectrometer, together with a specular reflectance accessory and a polarizer, is used to measure the reflectance at incidence angles of 30° and 45°. In addition, an angle-resolved scatterometer is used to measure the reflectance at the wavelength of 891 nm. Measured reflectance shows very good temporal and spatial coherence. Furthermore, the magnitude of the evanescent waves at the PC-Ag interface is plotted in terms of the wavelength and the incidence angle. It is found that dip locations of the measured reflectance precisely match with the condition when the field intensity is largely enhanced.

Study of Omnidirectional Reflection Bandgap Extension in One-Dimensional Quasi-Periodic Metallic Photonic Crystal

NANO ◽  
2015 ◽  
Vol 10 (06) ◽  
pp. 1550088 ◽  
Author(s):  
Xuyang Xiao ◽  
Runping Chen
Keyword(s):  
Photonic Crystal ◽  
Near Infrared ◽  
Incidence Angle ◽  
Incident Angle ◽  
Stop Band ◽  
Wavelength Region ◽  
Short Wavelength Region ◽  
One Dimensional ◽  
Metal Thickness ◽  
Metallic Photonic Crystal

The reflection properties of light wave propagation in one-dimensional quasi-periodic metallic photonic crystal (PC) are comprehensively analyzed by transfer matrix method. In this work, we form a Fibonacci sequence quasi-periodic PC composed of metal and dielectric. The results demonstrate that the reflection stop band is strongly dependent on the periodic structure, metal thickness and incident angle. For this structure, the reflection stop band ranges from the visible light region to near-infrared region. Compared with the periodic metallic PC, the reflection stop bandwidth of our structure is wider. When the metal thickness increases, the reflection stop band is significantly enlarged. Furthermore, the reflection stop bandwidth slowly gets narrow and shifts to short wavelength region with the increase of incidence angle. Considering TE and TM wave at all incident angles, there is an omnidirectional reflection bandgap with width of 241nm for our investigated quasi-periodic metal PC.

scholarly journals Extension of the Measurable Wavelength Range for a Near-Infrared Spectrometer Using a Plasmonic Au Grating on a Si Substrate

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 403 ◽  
Author(s):  
Yu Suido ◽  
Yosuke Yamamoto ◽  
Gaulier Thomas ◽  
Yoshiharu Ajiki ◽  
Tetsuo Kan
Keyword(s):  
Wavelength Range ◽  
Near Infrared ◽  
Generalized Inverse ◽  
Incidence Angle ◽  
Spectroscopic Characteristics ◽  
Generalized Inverse Matrix ◽  
Infrared Spectrometer ◽  
Scanning Range ◽  
Near Infrared Spectrometer ◽  
Derivation Procedure

In this paper, we proposed near-infrared spectroscopy based on a Si photodetector equipped with a gold grating and extended the measurable wavelength range to cover 1200–1600 nm by improving a spectrum derivation procedure. In the spectrum derivation, photocurrent data during alteration of the incidence angle of the measured light were converted using a responsivity matrix R, which determines the spectroscopic characteristics of the photodetector device. A generalized inverse matrix of R was used to obtain the spectrum and to fit a situation where multiple surface plasmon resonance (SPR) peaks appeared in the scanning range. When light composed of two wavelengths, 1250 nm and 1450 nm, was irradiated, the two wavelengths were distinctively discriminated using the improved method.

scholarly journals Coupling of light and mechanics in a photonic crystal waveguide

2020 ◽  
Vol 117 (47) ◽  
pp. 29422-29430
Author(s):  
J.-B. Béguin ◽  
Z. Qin ◽  
X. Luan ◽  
H. J. Kimble
Keyword(s):  
Photonic Crystal ◽  
Near Infrared ◽  
Near Field ◽  
Stop Band ◽  
Band Edge ◽  
Quantum Limit ◽  
Spatial Period ◽  
Single Photons ◽  
Photonic Crystal Waveguide ◽  
Optomechanical Coupling

Observations of thermally driven transverse vibration of a photonic crystal waveguide (PCW) are reported. The PCW consists of two parallel nanobeams whose width is modulated symmetrically with a spatial period of 370 nm about a 240-nm vacuum gap between the beams. The resulting dielectric structure has a band gap (i.e., a photonic crystal stop band) with band edges in the near infrared that provide a regime for transduction of nanobeam motion to phase and amplitude modulation of an optical guided mode. This regime is in contrast to more conventional optomechanical coupling by way of moving end mirrors in resonant optical cavities. Models are developed and validated for this optomechanical mechanism in a PCW for probe frequencies far from and near to the dielectric band edge (i.e., stop band edge). The large optomechanical coupling strength predicted should make possible measurements with an imprecision below that at the standard quantum limit and well into the backaction-dominated regime. Since our PCW has been designed for near-field atom trapping, this research provides a foundation for evaluating possible deleterious effects of thermal motion on optical atomic traps near the surfaces of PCWs. Longer-term goals are to achieve strong atom-mediated links between individual phonons of vibration and single photons propagating in the guided modes (GMs) of the PCW, thereby enabling optomechanics at the quantum level with atoms, photons, and phonons. The experiments and models reported here provide a basis for assessing such goals.

Spectral control of thermal emission by periodic microstructured surfaces in the near-infrared region

2001 ◽  
Vol 18 (7) ◽  
pp. 1471 ◽  
Author(s):  
Hitoshi Sai ◽  
Hiroo Yugami ◽  
Yasuhiro Akiyama ◽  
Yoshiaki Kanamori ◽  
Kazuhiro Hane
Keyword(s):  
Near Infrared ◽  
Thermal Emission ◽  
Infrared Region ◽  
Microstructured Surfaces ◽  
Spectral Control ◽  
Near Infrared Region

Three-Dimensional Colloidal Crystal Arrays Exhibiting Stop Band in Near-Infrared Region

2010 ◽  
Vol 114 (39) ◽  
pp. 16389-16394 ◽  
Author(s):  
Mukesh Agrawal ◽  
Dieter Fischer ◽  
Smrati Gupta ◽  
Nikolaos E. Zafeiropoulos ◽  
Andrij Pich ◽  
...  
Keyword(s):  
Near Infrared ◽  
Colloidal Crystal ◽  
Stop Band ◽  
Three Dimensional ◽  
Infrared Region ◽  
Near Infrared Region

Y-TYPE PHOTONIC CRYSTAL WAVEGUIDE WITH MINIMUM BRANCHES SPACE

2006 ◽  
Vol 05 (06) ◽  
pp. 743-746
Author(s):  
SHOUZHEN HAN ◽  
JIE TIAN ◽  
CHENG REN ◽  
XINGSHENG XU ◽  
ZHIYUAN LE ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Focused Ion Beam ◽  
Near Infrared ◽  
Ion Beam ◽  
Infrared Region ◽  
Photonic Crystal Waveguide ◽  
Ion Beam Etching ◽  
Optical Integrated Circuits ◽  
All Optical

The abstract should summarize the context, content and conclusions of the paper in less than 200 words. We fabricated a two-dimensional Y-branch photonic crystal waveguide in the near infrared region by using focused ion beam etching and depositing system. The light guide characters of the waveguide were measured for three different spaces between branches. Field intensity distributions of TE polarized wave in the branches were simulated by using the transfer matrix method. Both the theoretical and experimental results show that the shortest space between branches of the photonic crystal waveguide is about 1.4 times wavelength of transmitted light. If the space became shorter, the light in the two branches would couple to each other seriously. This result might be helpful for the design of compact wave demultiplexer and all-optical integrated circuits.

The IGRINS YSO Survey II: Veiling Spectra of Pre-main-sequence Stars in Taurus-Auriga

2021 ◽  
Vol 922 (1) ◽  
pp. 27
Author(s):  
Benjamin Kidder ◽  
Gregory Mace ◽  
Ricardo López-Valdivia ◽  
Kimberly Sokal ◽  
Victoria E. Catlett ◽  
...  
Keyword(s):  
Near Infrared ◽  
Thermal Emission ◽  
Young Stellar Objects ◽  
Continuum Emission ◽  
Class Iii ◽  
Infrared Excess ◽  
Stellar Objects ◽  
Star Forming ◽  
Infrared Spectrometer ◽  
Low Mass

Abstract We present measurements of the H- and K-band veiling for 141 young stellar objects (YSOs) in the Taurus-Auriga star-forming region using high-resolution spectra from the Immersion Grating Near-Infrared Spectrometer. In addition to providing measurements of r H and r K , we produce low-resolution spectra of the excess emission across the H and K bands. We fit temperatures to the excess spectra of 46 members of our sample and measure near-infrared excess temperatures ranging from 1200–2200 K, with an average of 1575 ± 225 K. We compare the luminosity of the excess continuum emission in Class II and Class III YSOs and find that a number of Class III sources display a significant amount of excess flux in the near-infrared. We conclude that the mid-infrared SED slope, and therefore young stellar object classification, is a poor predictor of the amount of near-infrared veiling. If the veiling arises in thermal emission from dust, its presence implies a significant amount of remaining inner-disk (<1 au) material in these Class III sources. We also discuss the possibility that the veiling effects could result from massive photospheric spots, unresolved binary companions, or accretion emission. Six low-mass members of our sample contain a prominent feature in their H-band excess spectra that is consistent with veiling from cool photospheric spots.

scholarly journals White light generation using photonic crystal fiber with sub-micron circular lattice

2017 ◽  
Vol 68 (4) ◽  
pp. 282-289 ◽  
Author(s):  
Hamed Saghaei ◽  
Ashkan Ghanbari
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
White Light ◽  
Near Infrared ◽  
Metabolic Response ◽  
Stimulated Raman Scattering ◽  
Infrared Region ◽  
Visible Range ◽  
Crystal Fiber ◽  
White Light Generation

AbstractIn this paper, we study a photonic crystal fiber (PCF) with circular lattice and engineer linear and nonlinear parameters by varying the diameter of air-holes. It helps us obtain low and high zero dispersion wavelengths in the visible and nearinfrared regions. We numerically demonstrate that by launching 100 fs input pulses of 1, 2, and 5 kW peak powers with center wavelength of 532 nm from an unamplified Ti:sapphire laser into a 100 mm length of the engineered PCF, supercontinua as wide as 290, 440 and 830 nm can be obtained, respectively. The spectral broadening is due to the combined action of self-phase modulation, stimulated Raman scattering and parametric four-wave-mixing generation of the pump pulses. The third and the widest spectrum covers the entire visible range and a part of near infrared region making it a suitable source for both white light applications and optical coherence tomography to measure retinal oxygen metabolic response to systemic oxygenation.

Fabrication of air-bridged Kerr nonlinear polymer photonic crystal slab structures in near-infrared region

2012 ◽  
Vol 10 (11) ◽  
pp. 112202-112204 ◽  
Author(s):  
Ziming Meng Ziming Meng ◽  
Xiaolan Zhong Xiaolan Zhong ◽  
Chen Wang Chen Wang ◽  
Zhiyuan Li Zhiyuan Li
Keyword(s):  
Photonic Crystal ◽  
Near Infrared ◽  
Infrared Region ◽  
Photonic Crystal Slab ◽  
Near Infrared Region

Facile Synthesis of Conical Arrays with Broadband Antireflective Property

2014 ◽  
Vol 614 ◽  
pp. 79-83
Author(s):  
Wen Yan Zhang ◽  
Ling Yun Hao ◽  
Chun Hua Lu ◽  
Chun Hua Feng ◽  
Qin Lin ◽  
...  
Keyword(s):  
Mass Production ◽  
Smooth Surface ◽  
Near Infrared ◽  
Low Cost ◽  
Infrared Region ◽  
Polydimethyl Siloxane ◽  
Facile Synthesis ◽  
Specular Reflectance ◽  
Regular Shape ◽  
Reflective Property

Conical arrays of polydimethyl siloxane were fabricated by duplicating the morphology of needle tips. The prepared cones have periodic order and regular shape, with the bottom diameter of about 80 μm and height of about 250 μm. Due to their special structure, the conical arrays of polydimethyl siloxane exhibited broadband anti-reflective property. Compared with smooth surface, they could reduce the reflection of incident electromagnetic wave at ultraviolet, visible and near-infrared region. The specular reflectance was lower than 0.75% in the range of 250-2600 nm. The prepared PDMS cones have potential to be applied for antireflective devices. The method was simple for mass production of PDMS cones at low cost.

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