Anomalous Optical Transmission Phenomena in Photonic Crystals

Anomalous optical transmission phenomena have ever been discovered in various metamaterials, which can be modulated more easily in Photonic crystals (PhCs). Compared with the regular PhCs composed of round rods closely packed in air, the equal frequency contours (EFC) of honeycomb lattice PhCs constituted by trigonal rods are more rounded and more suitable to realize the all-angle left-handed negative refraction (AALNR) in the low band region. Due to the hex EFC distribution, the regular PhC can be applied in the optical collimator design. In the higher band regions, the more complicated refraction behaviors can be excited based on the intricate undulation of one band or the overlap of different bands in PhCs. These unique features will provide us with more understanding of electromagnetic wave propagation in PhCs and give important guideline for the design of new type optical devices.

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Modulation of Optical Transmission in Photonic Crystal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.538.42 ◽

2013 ◽

Vol 538 ◽

pp. 42-45

Author(s):

Guo Yan Dong ◽

Ji Zhou

Keyword(s):

Electromagnetic Wave ◽

Photonic Crystal ◽

Optical Transmission ◽

Electromagnetic Wave Propagation ◽

Negative Refraction ◽

Optical Devices ◽

Equal Frequency ◽

Special Effects ◽

Optical Effects ◽

New Type

The transmission properties of electromagnetic wave (EMW) can be modulated by the periodic structure of photonic crystal (PhC) to bring many novel optical effects. The special distributions of equal frequency contours (EFCs) can be used to control the wavefront state and transmission direction of propagating wave in PhC with some special effects, such as non-handed refraction. Based on the intricate undulation of one single band or the overlap of different bands, the phenomena of dual-negative refraction, symmetrical positive-negative refraction and triple refraction have been achieved in the higher band regions. These unique features will provide us with more understanding of electromagnetic wave propagation in PhCs and give important guideline for the design of new type optical devices.

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COMPARISONS OF NEGATIVE REFRACTION IN LEFT-HANDED MATERIALS AND PHOTONIC CRYSTALS

International Journal of Modern Physics B ◽

10.1142/s0217979205032371 ◽

2005 ◽

Vol 19 (23) ◽

pp. 3547-3561

Author(s):

LIANG FENG ◽

XIAO-PING LIU ◽

JIE REN ◽

YAN-FENG CHEN ◽

YONG-YUAN ZHU

Keyword(s):

Refractive Index ◽

Electromagnetic Wave ◽

Photonic Crystals ◽

Negative Refraction ◽

Positive Phase ◽

Negative Phase ◽

Negative Group ◽

Perfect Lens ◽

Left Handed ◽

Negative Refractions

Using the equifrequency surfaces (EFS) to describe negative refractions in left-handed materials (LHMs) and photonic crystals (PCs), negative phase and negative group refractive indexes in LHMs were compared with positive phase and negative group refractive indexes in PCs. The refractive indexes in PCs were dependent on frequencies and incident angles of electromagnetic wave, while indexes in LHMs were constant in the left-handed region. Furthermore, the phase compensating effect resulting from the negative phase refractive index was addressed to distinguish the perfect lens made of LHMs from the superlens realized in the all angle negative refraction (AANR) region of PCs.

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