Construction of Optical Topological Cavities Using Photonic Crystals

A novel design of the Fabry–Pérot optical cavity is proposed, utilizing both the topological interface state structures and photonic bandgap materials with a controllable reflection phase. A one-to-one correspondence between the traditional Fabry–Pérot cavity and optical topological cavity is found, while the tunable reflection phase of the photonic crystal mirrors provides an extra degree of freedom on cavity mode selection. The relationship between the Zak phase and photonic bandgap provides theoretical guidance to the manipulation of the reflection phase of photonic crystals. The dispersions of interface states with different topology origins are explored. Linear interfacial dispersion emerging in photonic crystals with the valley–spin Hall effect leads to an extra n = 0 cavity mode compared to the Zak phase–induced deterministic interface states with quadratic dispersion. The frequency of the n = 0 cavity mode is not affected by the cavity length, whose quality factor can also be tuned by the thickness of the photonic crystal mirrors. With the recent help of topology photonics in the tuning reflection phase and dispersion relationship, we hope our results can provide more intriguing ideas to construct topological optical devices.

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SPONTANEOUS EMISSION OF NANO-ENGINEERED FLUOROPHORES IN PHOTONIC CRYSTALS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863506003128 ◽

2006 ◽

Vol 15 (01) ◽

pp. 1-8 ◽

Cited By ~ 5

Author(s):

KAI SONG ◽

RENAUD VALLEE ◽

MARK VAN DER AUWERAER ◽

KOEN CLAYS

Keyword(s):

Photonic Crystal ◽

Photonic Crystals ◽

Point Source ◽

Emission Spectrum ◽

Spontaneous Emission ◽

Transmission Spectrum ◽

Photonic Bandgap ◽

Middle Layer ◽

Photonic Structure

The spontaneous emission of fluorophores embedded in a photonic crystal has been studied. By nano-engineering a sandwich-like photonic structure, such that fluorophore-coated photonic atoms constitute a middle layer between the photonic crystals, we have been able to precisely control the location of fluorophores in photonic crystals and exclude the presence of fluorophores at the surface of the crystal. It has been found that the stopband in the transmission spectrum is deeper than the stopband in the emission spectrum. We conjecture that the omnidirectional propagation of the emission from a point source in an incomplete photonic bandgap is the cause of the shallower stopband in emission.

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Behaviors of the multiple interface states in photonic crystal heterostructure with frequency-dependent dielectric functions

Modern Physics Letters B ◽

10.1142/s0217984921500536 ◽

2020 ◽

pp. 2150053

Author(s):

Xun Cui ◽

Li-Ming Zhao ◽

Yun-Song Zhou ◽

Hai-Tao Yan

Keyword(s):

Photonic Crystal ◽

Dirac Point ◽

Incident Angle ◽

Energy Levels ◽

Interface State ◽

Interface States ◽

Defect Band ◽

Multiple Interface ◽

Photonic Crystal Heterostructure ◽

Sinusoidal Function

In this paper, Dirac point method is used to study the interface state of one-dimensional photonic crystal heterojunction [Formula: see text] containing dispersive materials GaAs. We found that the energy levels of the interface states satisfy a simple sinusoidal function. We investigate the variation of the energy levels of the interface states with the incident angle, it is found that these interface states move toward high-frequency with the increase of the incident angle. At the same time, it is found that there is an extra localized band and it is further proved that the extra band corresponds to the defect band, and the energy levels of the defect band possess the same behavior with those of interface states.

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Optimizing one-dimensional photonic-crystals based semitransparent organic solar cells by tailoring reflection phase shift within photonic bandgap

Applied Physics Letters ◽

10.1063/1.3631675 ◽

2011 ◽

Vol 99 (9) ◽

pp. 093310 ◽

Cited By ~ 9

Keyword(s):

Solar Cells ◽

Phase Shift ◽

Photonic Crystals ◽

Organic Solar Cells ◽

Photonic Bandgap ◽

One Dimensional ◽

Reflection Phase

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Design of DNA Origami Diamond Photonic Crystals

10.1101/2019.12.17.880302 ◽

2019 ◽

Author(s):

Sung Hun Park ◽

Haedong Park ◽

Kahyun Hur ◽

Seungwoo Lee

Keyword(s):

Photonic Crystal ◽

Photonic Crystals ◽

Volume Fraction ◽

Photonic Bandgap ◽

Building Blocks ◽

Diamond Lattice ◽

Dna Origami ◽

Structural Constraints ◽

Molding Process ◽

Energy Devices

AbstractSelf-assembled photonic crystals have proven to be a fascinating class of photonic materials for non-absorbing structural colorizations over large areas and in diverse relevant applications, including tools for on-chip spectrometers and biosensors, platforms for reflective displays, and templates for energy devices. The most prevalent building blocks for the self-assembly of photonic crystals are spherical colloids and block copolymers (BCPs) due to the generic appeal of these materials, which can be crafted into large-area 3D lattices. However, due to the intrinsic limitations of these structures, these two building blocks are difficult to assemble into a direct rod-connected diamond lattice, which is considered to be a champion photonic crystal. Here, we present a DNA origami-route for a direct rod-connected diamond photonic crystal exhibiting a complete photonic bandgap (PBG) in the visible regime. Using a combination of electromagnetic, phononic, and mechanical numerical analyses, we identify (i) the structural constraints of the 50 megadalton-scale giant DNA origami building blocks that could self-assemble into a direct rod-connected diamond lattice with high accuracy, and (ii) the elastic moduli that are essentials for maintaining lattice integrity in a buffer solution. A solution molding process could enable the transformation of the as-assembled DNA origami lattice into a porous silicon- or germanium-coated composite crystal with enhanced refractive index contrast, in that a champion relative bandwidth for the photonic bandgap (i.e., 0.29) could become possible even for a relatively low volume fraction (i.e., 16 vol%).

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Logically combined photonic crystal – A Fabry Perot optical cavity

Photonics and Nanostructures - Fundamentals and Applications ◽

10.1016/j.photonics.2016.09.002 ◽

2016 ◽

Vol 22 ◽

pp. 29-34

Author(s):

G. Alagappan ◽

C.E. Png

Keyword(s):

Photonic Crystal ◽

Optical Cavity ◽

Fabry Perot

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Single-Port Coherent Perfect Loss in a Photonic Crystal Nanobeam Resonator

Nanomaterials ◽

10.3390/nano11123457 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3457

Author(s):

Jihoon Choi ◽

Heeso Noh

Keyword(s):

Photonic Crystal ◽

Phase Shift ◽

Lattice Constant ◽

Wavelength Range ◽

Photonic Bandgap ◽

Single Port ◽

Coupling Loss ◽

Magnetic Conductor ◽

Perfect Magnetic Conductor ◽

Fabry Perot

We numerically demonstrated single-port coherent perfect loss (CPL) with a Fabry–Perot resonator in a photonic crystal (PC) nanobeam by using a perfect magnetic conductor (PMC)-like boundary. The CPL mode with even symmetry can be reduced to a single-port CPL when a PMC boundary is applied. The boundary which acts like a PMC boundary, here known as a PMC-like boundary, and can be realized by adjusting the phase shift of the reflection from the PC when the wavelength of the light is within the photonic bandgap wavelength range. We designed and optimized simple Fabry–Perot resonator and coupler in nanobeam to get the PMC-like boundary. To satisfy the loss condition in CPL, we controlled the coupling loss in the resonator by modifying the lattice constant of the PC used for coupling. By optimizing the coupling loss, we achieved zero reflection (CPL) in a single port with a PMC-like boundary.

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A Nanoscale Photonic Crystal Cavity Optomechanical System for Ultrasensitive Motion Sensing

Crystals ◽

10.3390/cryst11050462 ◽

2021 ◽

Vol 11 (5) ◽

pp. 462

Author(s):

Ji Xia ◽

Fuyin Wang ◽

Chunyan Cao ◽

Zhengliang Hu ◽

Heng Yang ◽

...

Keyword(s):

Photonic Crystal ◽

Optical Cavity ◽

Optical Quality ◽

Optical Force ◽

Mechanical Oscillator ◽

Maximum Displacement ◽

Optomechanical System ◽

High Optical Quality ◽

Hybrid Platform ◽

Optomechanical Coupling

Optomechanical nanocavities open a new hybrid platform such that the interaction between an optical cavity and mechanical oscillator can be achieved on a nanophotonic scale. Owing to attractive advantages such as ultrasmall mass, high optical quality, small mode volume and flexible mechanics, a pair of coupled photonic crystal nanobeam (PCN) cavities are utilized in this paper to establish an optomechanical nanosystem, thus enabling strong optomechanical coupling effects. In coupled PCN cavities, one nanobeam with a mass meff~3 pg works as an in-plane movable mechanical oscillator at a fundamental frequency of . The other nanobeam couples light to excite optical fundamental supermodes at and 1554.464 nm with a larger than 4 × 104. Because of the optomechanical backaction arising from an optical force, abundant optomechanical phenomena in the unresolved sideband are observed in the movable nanobeam. Moreover, benefiting from the in-plane movement of the flexible nanobeam, we achieved a maximum displacement of the movable nanobeam as 1468 . These characteristics indicate that this optomechanical nanocavity is capable of ultrasensitive motion measurements.

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