Far-field detection of two-dimensional terahertz topological photonic crystals

We review the simulation work for the far-field focus and dispersionless anticrossing bands in two-dimensional (2D) photonic crystals. In a two-dimensional photonic-crystal-based concave lens, the far-field focus of a plane wave is given by the distance between the focusing point and the lens. Strong and good-quality far-field focusing of a transmitted wave, explicitly following the well-known wave-beam negative refraction law, can be achieved. The spatial frequency information of the Bloch mode in multiple Brillouin zones (BZs) is investigated in order to indicate the wave propagation in two different regions. When considering the photonic transmission in a 2D photonic crystal composed of a negative phase-velocity medium (NPVM), it is shown that the dispersionless anticrossing bands are generated by the couplings among the localized surface polaritons of the NPVM rods. The photonic band structures of the NPVM photonic crystals are characterized by a topographical continuous dispersion relationship accompanied by many anticrossing bands.

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NEGATIVE REFRACTION AND SUBWAVELENGTH FOCUSING USING PHOTONIC CRYSTALS

Modern Physics Letters B ◽

10.1142/s0217984904007803 ◽

2004 ◽

Vol 18 (25) ◽

pp. 1275-1291 ◽

Cited By ~ 4

Author(s):

EKMEL OZBAY ◽

KAAN GUVEN ◽

ERTUGRUL CUBUKCU ◽

KORAY AYDIN ◽

B. KAMIL ALICI

Keyword(s):

Optical Properties ◽

Photonic Crystals ◽

Negative Refraction ◽

Numerical Study ◽

Effective Index ◽

Index Of Refraction ◽

Far Field ◽

Two Dimensional ◽

Flat Lens ◽

Effective Index Of Refraction

In this article, we present an experimental and numerical study of novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction. We investigate two mechanisms which utilize the band structure of the PC to generate a negative effective index of refraction (n eff <0) and demonstrate the negative refraction experimentally. To the isotropic extend of n eff , different PC slab structures are employed to focus the radiation of a point source. It is shown experimentally that the PC can generate an image of the source with subwavelength resolution in the vicinity of the PC interface. Using a different PC, one can also obtain a far field focusing. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC-based lenses can surpass limitations of conventional lenses and lead to novel optics applications.

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Far-field focusing properties of two-dimensional honeycomb photonic crystals and the effect of the interface

Acta Physica Sinica ◽

10.7498/aps.56.6403 ◽

2007 ◽

Vol 56 (11) ◽

pp. 6403

Author(s):

Li Guo-Jun ◽

Kang Xue-Liang ◽

Li Yong-Ping

Keyword(s):

Photonic Crystals ◽

Far Field ◽

Two Dimensional ◽

Focusing Properties

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Far-field of GaN film-transferred green light-emitting diodes with two-dimensional photonic crystals

Optics Express ◽

10.1364/oe.17.008795 ◽

2009 ◽

Vol 17 (11) ◽

pp. 8795 ◽

Cited By ~ 14

Author(s):

Chun-Feng Lai ◽

Jim-Yong Chi ◽

Hao-Chung Kuo ◽

Hsi-Hsuan Yen ◽

Chia-En Lee ◽

...

Keyword(s):

Photonic Crystals ◽

Light Emitting Diodes ◽

Green Light ◽

Far Field ◽

Two Dimensional ◽

Light Emitting ◽

Gan Film

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Far Field Detection of Different Elements Using Photonic Crystals

Journal of Nanoelectronics and Optoelectronics ◽

10.1166/jno.2017.2026 ◽

2017 ◽

Vol 12 (4) ◽

pp. 400-403 ◽

Cited By ~ 5

Author(s):

Simranjit Singh ◽

Harmandeep Kaur ◽

Kanwarpreet Singh

Keyword(s):

Photonic Crystals ◽

Far Field ◽

Field Detection

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Enhancing the photoluminescence response from thick Ge-on-Si layers using the photonic crystals

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac32fe ◽

2021 ◽

Author(s):

Dmitry V Yurasov ◽

Artem N Yablonskiy ◽

Natalya A Baidakova ◽

Mikhail V Shaleev ◽

Ekaterina E Rodyakina ◽

...

Keyword(s):

Photonic Crystals ◽

Room Temperature ◽

Optically Active ◽

Far Field ◽

Two Dimensional ◽

Wave Analysis ◽

Room Temperature Photoluminescence ◽

Order Of Magnitude ◽

Spectroscopy Optical ◽

Photoluminescence Response

Abstract More than an order of magnitude enhancement of the room-temperature photoluminescence (PL) signal from rather thick Ge layers grown on Si(001) was obtained by utilization of the two-dimensional photonic crystals (PhC). A set of PhCs with different periods and filling factors was fabricated and studied using a micro-PL spectroscopy. Optical features of the fabricated PhCs were also theoretically modeled using a rigorously coupled wave analysis which allowed to bring the observed peaks in the PL response into correlation with the different modes of PhC. In particular, we were able to associate the well-resolved peaks in the PL spectra with the optically active modes of the PhCs. The obtained results proved the possibility of using a homogeneously distributed active medium in PhCs without the formation of specially designed cavities in order to redistribute the internal emitted light into the required modes and efficiently extract it to the far field. The relative simplicity and higher tolerance to fabrication imperfections, as well as the large working area of such kind of PhCs as compared to PhCs with microcavities can be advantageous for creating a PhC-based Si-compatible light source for the telecom band.

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