In electromagnetism (covering areas like optics and photonics), a meta material (or metamaterial) is an object that gains its (electromagnetic) material properties from its structure rather than inheriting them directly from the materials it is composed of. This term is particularly used when the resulting material has properties not found in naturally formed substances.
MLSH
1•100
超材料及其对材料研究的启示
Random composites for double negative materials
Ni-Al2O3 Composites
Z.C.Shi, R.H.Fan* et al, Advanced Materials, 2012,24,2349–2352
Shandong University
天津力神电池股份有限公司学术报告会
陶瓷材料电学性能
范润华
fan@ 材料液固结构演变与加工教育部重点实验室(MLSH) 山东大学材料科学与工程学院无机非金属材料研究所
提纲
关于电学物理性能参数 超材料(metamaterials)及其对材料研究的启示 高介材料与电容器储能 逾渗与导体-绝缘体复合材料电学性能 固体电解质的若干问题 结束语
MLSH
1•144
超材料及其对材料研究的启示ffect of silver content on the frequency dependence of impedance (a, b) and permittivity (c, d) Z.C.Shi, R.H.Fan et al, APL 2011,99(1):071127
Fe O 34
(Fe Al ) O x 1-x 2 3
Fe
FA60
Intensity(Relative)
FA50 FA40 FA20 FA10
20
30
40
50
60
2 degree
Shandong University □ □ fan@
70
Shandong University □ □ fan@
Line width 0.28 0.58 0.37 0.58
MLSH
A/% 40.5 13.7 35.2 10.5
1•188
超材料及其对材料研究的启示
Negative Permittivity
FA20
Subspectrum Fe Sextet
Fe3O4 Sextet Fe3+ Doublet(1) Fe2+ Doublet(2)
IS/mm·s-1 0.00 0.45 0.30 0.83
QS/mm·s-1 0.00 0.14 0.53 1.83
Magnetic field/T 33.14 44.28 -
55
超材料及其对材料研究的启示
Double Negative Materials (DNMs) having simultaneous negative permittivity and permeability
Refractive index: n2
When < 0 and < 0 simultaneously, we have to choose
The permittivity of metal is given by
() 1
2 ep
( i )
Plasma
frequency:
2 ep

ne2
0 me
(typically in the UV region)
where n is the electron density, and me is the electron mass
Shandong University fan@
Insititute of Inorganic Nonmetallic Materials
22
作用物理量 感应物理量
关于电学物理性能参数
电场对材料的作用
公式
材料内部的变化 性能参数
性能类别
电场E
电流密度J 极化强度P 材料形变
J=E P=(r-1)0E =d E
Shandong University □ □ fan@
MLSH
•88
超材料及其对材料研究的启示
两类双负材料
损耗型 基于金属的等离体子振荡，频带宽，可调性好 透明型 基于各种介电谐振和磁谐振，通带较窄。研究热点。
1000uW/cm2 ~ 5uW/cm2
n


Maxwell’s equation: k E H , k H E
n>0
E
( > 0 , > 0)
k
S H
Right handed materials
n<0
E
( < 0 , < 0)
k
S
H
Left handed materials
iCU
代表储存电能能力, 反映了电损耗
交变电场条件下
U
➢磁导率( )是材料对一个外加磁场线性反应的
磁化程度，实际上反映了磁化的难易。电子旋转
。
= - i
代表储存磁能的能力， 反映了磁损耗
Shandong University fan@
世界上第一块Metamaterials
UCSD, PRL 84, 4184 (2000)
Is it possible for “true” materials rather than
metamaterials to have double negative properties
Shandong University □ □ fan@
Shandong University □ □ fan@
MLSH
1111
超材料及其对材料研究的启示
Ni-Al2O3 Composites
Z.C.Shi, R.H.Fan* et al, Advanced Materials, 2012,24,2349–2352
Shandong University □ □ fan@
MLSH
1122
Ni-Al2O3 Composites
超材料及其对材料研究的启示
Z.C.Shi, R.H.Fan* et al, Advanced Materials, 2012,24,2349–2352
Shandong University fan@
Insititute of Inorganic Nonmetallic Materials
66
超材料及其对材料研究的启示
DNMs open a new field in physics, engineering, material science and optics
Shandong University □□□□fanfa@ns@
MLSH
•77
超材料及其对材料研究的启示
About Metamaterials
Metamaterials realized based on split ring resonators- Resonant Approach towards DNM
Z.C.Shi, R.H.Fan et al, APL 2011,99(1):071127
Shandong University □ □ fan@
MLSH 16
超材料及其对材料研究的启示
Fe-FeAl2O4-Fe3O4-Al2O3 Bulk Nanocomposites
Shandong University □ □ fan@
MLSH
1199
超材料及其对材料研究的启示
负介电与等离体振荡特性
材料电阻率的影响 导电网络的形成 负介电常数可能与自由电子的等 离体振荡有关
Shandong University □ □ fan@
MLSH
1133
Ag-Al2O3 Composites
超材料及其对材料研究的启示
Z.C.Shi, R.H.Fan et al, APL 2011,99(1):071127
Shandong University □ □ fan@
Shandong University □ □ fan@
MLSH
1•155
超材料及其对材料研究的启示
(a)
(b)
Silver particle Alumina
Air
Vacuum
(c)
(d)
Numerical simulation (a, b) and equivalent circuit analysis (c, d) results
Insititute of Inorganic Nonmetallic Materials
44
关于电学物理性能参数
➢ 金属也绝缘 ➢ 金属亮晶晶 ➢ 微波炉防护 ➢ 磁性存极限
电磁波谱
Shandong University fan@
Insititute of Inorganic Nonmetallic Materials
Damping factor:


0
where is the electric conductivity