A tunable interference filter includes: a first substrate provided with a first reflection film; and a second substrate provided with a second reflection film facing the first reflection film with a gap between the first reflection film and the second reflection film. The first substrate includes a movable portion that is a portion where the first reflection film is provided, a diaphragm portion surrounding the movable portion, and a base portion supporting the movable portion via the diaphragm portion to allow displacement of the movable portion in a thickness direction, the diaphragm portion is a portion in which a thickness at the first substrate is thinner than a thickness of the base portion due to a groove opened in a surface of the first substrate, and a width of a bottom portion of the groove is larger than a width of an opening of the groove.

A silicon-on-insulator chip including an arrayed waveguide grating (AWG) and an array of detector remodulators (DRMs) in a planar arrangement with the AWG such that the modulators or modulators and detectors of said DRMs are located within the same plane as the waveguides of the AWG; and wherein each DRM is located at an input or output of the AWG.

A light detection device includes a Fabry-Perot interference filter provided with a light transmitting region on a predetermined line, a light detector disposed on one side with respect to the Fabry-Perot interference filter on the line, a package having an opening positioned on the other side with respect to the Fabry-Perot interference filter on the line, a light transmitting member provided in the package such that the opening is blocked, and a temperature control element having an endothermic region thermally connected to the Fabry-Perot interference filter and the light detector. The endothermic region is positioned on one side with respect to the light detector on the line.

The present disclosure is directed to systems and methods for omniresonant broadband coherent perfect absorption of incoherent light over large bandwidths. The apparatus and methods that enable 100% effective optical absorption in a structure, irrespective of the material from which it is constructed, over a large, continuous bandwidth (omniresonance) in ultrathin devices. Specifically, we demonstrate achromatic optical absorption (omniresonance) in a planar Fabry-Prot micro-cavity via angularly multiplexed phase-matching. By assigning each wavelength to an appropriate angle of incidence, the micro-cavity is rendered absorbing with continuous spectral range. For example, the linewidth of a single-order 0.7 nm wide resonance is de-slanted in spectral-angular space to become a 70 nm wide achromatic resonance spanning multiple cavity free spectral ranges. The embodied invention can have important applications in, e.g., harvesting solar energy, white-light micro-lasers, and other broadband resonantly enhanced optical effects.

An optical filter includes a substrate, a first reflective film provided on the substrate, a second reflective film disposed to face the first reflective film, and a supporting portion provided on the substrate and supporting the second reflective film. The first reflective film is protected with a first protective film so as not to be exposed and the second reflective film is protected with a second protective film so as not to be exposed.

A system for optical linear sampling and coherent detection of an optical signal OS comprises a source emitting a pulsed optical signal SP and an optical coupler that splits the pulsed optical signal SP into two replicas, the first replica of the pulsed optical signal SP is sent to a first optical hybrid circuit and the second replica of the pulsed optical signal SP is send to a second optical hybrid circuit, a source emitting an optical signal OS and optical coupler that splits the incoming optical signal OS into two replicas, the first replica of the incoming optical signal OS is sent to the first optical hybrid circuit and the second replica of the incoming optical signal OS is sent to to a wavelength recovery device WVLR, whose output is a continuous-waveform optical signal CW at the central wavelength of the incoming optical signal OS, which sends it to the second optical hybrid circuit. such that the optical signal OS is sampled within the first hybrid circuit and the continuous waveform optical signal CW is sampled in the second hybrid circuit, and a device BDADC comprising balanced photodectors detecting optical signals at the output of the two optical hybrid circuits and an analog/digital converter ADC.

The embodiments of the present disclosure relate to a Fabry-Perot cavity, a manufacturing method thereof, an interferometer and a measuring method for wavelength of light. The Fabry-Perot cavity includes two parallel substrates and a liquid crystal layer between the two parallel substrates, and a sealed cavity is defined between the two substrates; wherein the two substrates comprise a first substrate and a second substrate, light could enter through the first substrate and run out from the second substrate via the liquid crystal layer, and a deflection angle of the liquid crystal layer could be changed by applying various voltage between the two substrates.

A temperature regulating unit is attached to a first incident surface of a first component through a first transparent electrode. The temperature regulating unit is composed of a Peltier element. The temperature regulating unit includes an opening through which the target light can pass. The temperature regulating unit has, for example, a rectangular parallelepiped outer shape in which a surface perpendicular to an optical axis is square-shaped. The opening is formed to penetrate through the temperature regulating unit in a direction perpendicular to the optical axis and has a circular shape in a plan view.

A Fabry-Perot sensor for measuring an inclination. The sensor is fixed on a static detected object, where a mass block is flexibly connected to a top plate, thus the line between the center of gravity of the mass block and the connecting point on the top plate is perpendicular to the horizontal plane. This creates a Fabry-Perot cavity between a reflecting surface disposed at one end of the mass block and the end of an optic fiber. When the detected object is tilted, the line between the center of gravity of the mass block and its connecting point on the top plate remains perpendicular and the F-P cavity length will have a variation in length. The change of cavity length is measured in accordance with the Fabry-Perot principle, thereby the tilting angle, which is the inclination of the detected object, of the mass block is measured.

An apparatus includes a sensor module. The sensor module includes an electromagnetic radiation sensor configured to provide electromagnetic radiation sensor data. The sensor module further includes a coded mask configured to modulate electromagnetic radiation incident to the electromagnetic radiation sensor and from which the electromagnetic radiation sensor data is generated. The apparatus further includes a computation module configured to obtain the electromagnetic radiation sensor data from the electromagnetic radiation sensor. The computation module is further configured to detect a property from the electromagnetic radiation sensor data using an artificial neural network. The computation module is further configured to output information related to the detected property via an output.