Oscillator and imaging apparatus utilizing resonant tunneling diode structure
First Claim
Patent Images
1. An oscillator for oscillating an electromagnetic wave, comprising:
- a substrate; and
a resonant tunneling diode provided on the substrate,wherein the resonant tunneling diode comprises at least two quantum well layers and plural barrier layers for separating the quantum well layers from each other,wherein the two quantum well layers each has a lattice constant different from a lattice constant of the substrate and a film thickness smaller than a critical film thickness,wherein the plural barrier layers include a first barrier layer sandwiched by the two quantum well layers;
wherein the first barrier layer has such a film thickness that carriers are able to be subjected to a photon assist tunnel between sub-bands of the two quantum well layers, andwherein a strain of the first barrier layer and the two quantum well layers is compensated by a strain of a barrier layer among the plural barrier layers that is not sandwiched by the two quantum well layers.
1 Assignment
0 Petitions
Accused Products
Abstract
An oscillator including a substrate and a resonant tunneling diode including a gain medium provided on the substrate. The gain medium includes at least two quantum well layers and plural barrier layers for separating the quantum well layers from each other. The quantum well layers each have one of a compressive strain and a tensile strain. The plural barrier layers that sandwich the quantum well layers having the strain have a strain in a direction opposite to the direction of the strain of the quantum well layers.
-
Citations
14 Claims
-
1. An oscillator for oscillating an electromagnetic wave, comprising:
-
a substrate; and a resonant tunneling diode provided on the substrate, wherein the resonant tunneling diode comprises at least two quantum well layers and plural barrier layers for separating the quantum well layers from each other, wherein the two quantum well layers each has a lattice constant different from a lattice constant of the substrate and a film thickness smaller than a critical film thickness, wherein the plural barrier layers include a first barrier layer sandwiched by the two quantum well layers; wherein the first barrier layer has such a film thickness that carriers are able to be subjected to a photon assist tunnel between sub-bands of the two quantum well layers, and wherein a strain of the first barrier layer and the two quantum well layers is compensated by a strain of a barrier layer among the plural barrier layers that is not sandwiched by the two quantum well layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An oscillator for oscillating an electromagnetic wave, comprising:
-
a substrate; and a resonant tunneling diode provided on the substrate, wherein the resonant tunneling diode comprises; a first barrier layer that has a lattice constant different from a lattice constant of the substrate and has a film thickness smaller than a critical film thickness; a first quantum well layer that is in contact with the first barrier layer, has a lattice constant different from the lattice constant of the substrate, and has a film thickness smaller than the critical film thickness; a second barrier layer that is in contact with the first quantum well layer, has a film thickness smaller than the critical film thickness, and is so constructed that carriers in a sub-band of the first quantum well layer are able to be subjected to a photon assist tunnel; a second quantum well layer that is in contact with the second barrier layer, is arranged on a side opposite to the first quantum well layer via the second barrier layer, has a lattice constant different from the lattice constant of the substrate, and has a film thickness smaller than the critical film thickness; and a third barrier layer that is in contact with the second quantum well layer, has a lattice constant different from the lattice constant of the substrate, and has a film thickness smaller than the critical film thickness, wherein a strain of the second barrier layer and the first and second quantum well layers is compensated by a strain of the first and third barrier layers. - View Dependent Claims (14)
-
Specification