An Optimization of Two-Dimensional Photonic Crystals at Low Refractive Index Material

Photonic crystal (PC) is usually realized in materials with high refractive indices contrast to achieve a photonic bandgap (PBG). In this work, we demonstrated an optimization of two-dimensional PCs using a low refractive index polymer material. An original idea of assembly of polymeric multiple rings in a hexagonal configuration allowed us to obtain a circular-like structure with higher symmetry, resulting in a larger PBG at a low refractive index of 1.6. The optical properties of such newly proposed structure are numerically calculated by using finite-difference time-domain (FDTD) method. The proposed structures were realized experimentally by using a direct laser writing technique based on low one-photon absorption method.

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Deterministic Insertion of KTP Nanoparticles into Polymeric Structures for Efficient Second-Harmonic Generation

Crystals ◽

10.3390/cryst9070365 ◽

2019 ◽

Vol 9 (7) ◽

pp. 365 ◽

Cited By ~ 2

Author(s):

Dam Thuy Trang Nguyen ◽

Ngoc Diep Lai

Keyword(s):

Second Harmonic Generation ◽

Harmonic Generation ◽

Collection Efficiency ◽

Second Harmonic ◽

Fdtd Method ◽

Photon Absorption ◽

Experimental Result ◽

Direct Laser ◽

Light Matter Interaction ◽

Difference Time

We investigate theoretically and experimentally the creation of virtually any polymer-based photonic structure containing individual nonlinear KTiOPO 4 nanoparticles (KTP NPs) using low one-photon absorption (LOPA) direct laser writing (DLW) technique. The size and shape of polymeric microstructures and the position of the nonlinear KTP crystal inside the structures, were perfectly controlled at nanoscale and on demand. Furthermore, we demonstrated an enhancement of the second-harmonic generation (SHG) by a factor of 90 when a KTP NP was inserted in a polymeric pillar. The SHG enhancement is attributed to the resonance of the fundamental light in the cavity. This enhancement varied for different KTP NPs, because of the random orientation of the KTP NPs, which affects the light/matter interaction between the fundamental light and the NP as well as the collection efficiency of the SHG signal. The experimental result are further supported by a simulation model using Finite-Difference Time-Domain (FDTD) method.

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Design of two-dimensional photonic crystal nanocavities with low-refractive-index material cladding

Journal of Optics ◽

10.1088/2040-8978/12/1/015108 ◽

2009 ◽

Vol 12 (1) ◽

pp. 015108 ◽

Cited By ~ 4

Author(s):

M Okano ◽

T Yamada ◽

J Sugisaka ◽

N Yamamoto ◽

M Itoh ◽

...

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Two Dimensional ◽

Dimensional Photonic Crystal ◽

Refractive Index Material ◽

Two Dimensional Photonic Crystal ◽

Low Refractive Index

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Analysis of two-dimensional photonic crystal L-type cavities with low-refractive-index material cladding

Journal of Optics ◽

10.1088/2040-8978/12/7/075101 ◽

2010 ◽

Vol 12 (7) ◽

pp. 075101 ◽

Cited By ~ 13

Author(s):

M Okano ◽

T Yamada ◽

J Sugisaka ◽

N Yamamoto ◽

M Itoh ◽

...

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Two Dimensional ◽

Dimensional Photonic Crystal ◽

Refractive Index Material ◽

Two Dimensional Photonic Crystal ◽

Low Refractive Index

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Analysis of Two-Dimensional Photonic Crystal Cavities with Low Refractive Index Material Cladding

10.7567/ssdm.2009.i-1-8 ◽

2009 ◽

Author(s):

T. Yamada ◽

M. Okano ◽

J. Sugisaka ◽

N. Yamamoto ◽

M. Itoh ◽

...

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Two Dimensional ◽

Photonic Crystal Cavities ◽

Dimensional Photonic Crystal ◽

Refractive Index Material ◽

Two Dimensional Photonic Crystal ◽

Low Refractive Index

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Direct laser writing and applications of dielectric microstructures with low refractive index contrast

10.1117/12.875951 ◽

2011 ◽

Author(s):

Vygantas Mizeikis ◽

Vytautas Purlys ◽

Lina Maigyte ◽

Kestutis Staliunas ◽

Saulius Juodkazis

Keyword(s):

Refractive Index ◽

Direct Laser Writing ◽

Laser Writing ◽

Refractive Index Contrast ◽

Direct Laser ◽

Index Contrast ◽

Low Refractive Index

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Investigation of Contact Conditions During Stamping of a Thin Plate

Volume 2A: Advanced Manufacturing ◽

10.1115/imece2020-24547 ◽

2020 ◽

Author(s):

Harshal Y. Shahare ◽

Rohan Rajput ◽

Puneet Tandon

Keyword(s):

Wave Propagation ◽

Material Properties ◽

High Speed ◽

Fdtd Method ◽

Propagation Model ◽

Transmitted Wave ◽

Two Dimensional ◽

Contact Conditions ◽

Simulation Based ◽

Difference Time

Abstract Stamping is one of the most used manufacturing processes, where real-time monitoring is quite difficult due to high speed of the mechanical press, which leads to deterioration of the accuracy of the products In the present work, a method is developed to model elastic waves propagation in solids to measure contact conditions between die and workpiece during stamping. A two-dimensional model is developed that reduces the wave propagation equations to two-dimensional equations. To simulate the wave propagation inside the die-workpiece model, the finite difference time domain (FDTD) method and modified Yee algorithm has been employed. The numerical stability of the wave propagation model is achieved through courant stability condition, i.e., Courant-Friedrichs-Lewy (CFL) number. Two cases, i.e., flat die-workpiece interface and inclined die-workpiece interface, are investigated in the present work. The elastic wave propagation is simulated with a two-dimension (2D) model of the die and workpiece using reflecting boundary conditions for different material properties. The experimental and simulation-based results of reflected and transmitted wave characteristics are compared for different materials in terms of reflected and transmitted wave height ratio and material properties such as acoustic impedance. It is found that the numerical simulation results are in good agreement with the experimental results.

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Design and optimization of two dimensional photonic crystal based optical filter

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863515500277 ◽

2015 ◽

Vol 24 (03) ◽

pp. 1550027 ◽

Cited By ~ 10

Author(s):

G. Rajalakshmi ◽

A. Sivanantha Raja ◽

D. Shanmuga Sundar

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Transmission Spectrum ◽

Filter Design ◽

Photonic Band Gap ◽

Fdtd Method ◽

Optical Filter ◽

Two Dimensional ◽

Dimensional Photonic Crystal ◽

Two Dimensional Photonic Crystal

In this paper, the channel drop filter based on two dimensional photonic crystal is proposed. The structure is made of silicon rods with the refractive index n1 = 3.4641 which are perforated in air with refractive index n2 = 1. The simulation results are obtained using 2D finite difference time domain (FDTD) method. The photonic band gap is calculated by plane wave expansion solver method. Resonant mode of the ring resonator and the filter transmission spectrum is calculated using 2D FDTD method. Full width half maximum (FWHM) bandwidth of the filter at the output transmission spectrum from 1.508 μm to 1.512 μm is 4 nm. The quality factor of the filter is 377.5 and the proposed filter design is around 21 × 15 μm which is suitable for photonic integrated circuits.

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